Update of the Google Scholar PDF Metadata Retrieval Library

Published by Joeran Beel on

In the past few weeks, several users reported that Docear could not retrieve metadata more from Google Scholar any more. It took as a while, but now we found and fixed the problem – hopefully. We need your help to test if the fixed version really works well for all of you (it’s very hard to test for us because Google Scholar often did not block us while it did block some users).

Here is how you can install the new Google Scholar PDF Metadata Retrieval Library:

  1. Close Docear if it’s currently running
  2. Download the Google Scholar library.
  3. Replace the existing library with the new one. You find your old library in a path like C:\Program Files (x86)\Docear\plugins\org.docear.plugin.bibtex\lib\
  4. Start Docear
  5. Request metadata 🙂

Please let us know if the new library works, in particular if you had problems with the old one. Please note that even with the new library you might enter captchas occasionally. However, with the old library, captchas were occurring again and again for some users. This problem should be fixed (after entering the captcha correctly, you should be able to retrieve metadata at least for a few dozens of PDFs).

Categories: Docear

45 Comments

Katrina · 21st October 2014 at 14:41

I just downloaded docear and after creating a set of references (without any problems) it stopped working after like 30 documents. Captcha request keep appearing and after entering the correct word the next one comes right up. It does not manage to find anything on Google Scholar anymore, the Captcha Requests just keep going on…

I’d be grateful for some help with this issue.

Best regards

Katrina

Katrina · 21st October 2014 at 14:44

…one additional question: I followed the instructions given above about how to solve this problem. I was wondering though, how to actually replace the library. If I just delete the old one, I assume all my stored data will be gone? If I put the new library in the old place, do I need to adjust the name or something else in order to make it work?

Thanks, best

Katrina

    Joeran [Docear] · 23rd October 2014 at 09:33

    Hi Katrina,

    there is a difference between your “reference library”, i.e. the BibTeX file in which all your references are stored, and the “software library” that is responsible for fetching metadata from Google Scholar. In this post I am referring to the software library. So, if you exactly follow the instructions, none of your existing references will be deleted. Just download http://downloads.docear.org/docear-metadata-lib-0.0.1.jar and save the file docear-metadata-lib-0.0.1.jar in e.g. C:Program Files (x86)Docearpluginsorg.docear.plugin.bibtexlib (there will already be a file called “docear-metadata-lib-0.0.1.jar” <- overwrite it with the new file)

Chris · 27th November 2014 at 06:54

Joeran,

I just saw this update, started using it, and it’s worked very well for me. Very happy indeed.

Leon · 12th December 2014 at 04:36

I also implemented the .jar switch.

When I restarted Docear, I only needed to enter one captcha and the meta-retrieval was up and running.

Thanks!

Edgar · 16th December 2014 at 21:23

Hello. I changed the library but it still doesn´t work. I tried out several papers and none could retrieve a thing. Any additional idea of what could I do to succesfully retrieve metadata? Thanks.

sw · 18th December 2014 at 20:17

it worked! wonderful, I was about to delete docear, although I loved it for it’s mindmap function. Was really frustrated not beeing able to automaically read in my loads of pdf. Now everything is fine. Thank you. Anyway it was not to easy to find this site with the solution. I tried the five different methods you proposed in another entry. Maybe delete the other one or put a link?

Henrik · 15th January 2015 at 15:50

Hello,
I changed the library too, but theres no change. When I search a title docear starts but searching but stops immediately and there are no results. A manual search in google scholar always shows the right paper.

I’m running Docear 1.1.1 build239 on a Windows 7 system.

Thanks

Claudio · 16th February 2015 at 18:13

Hi,

Just starting to use Docear … Metadata extraction is not working at all. I´ve tried all solutions. Was never asked for a captcha.

Any other possibilities? Updates?

Thanks

Federico · 19th February 2015 at 11:56

I have just started a new project, some months after my last use of Docear and I agree with Claudio: metadata extraction is not working at all. Any workarounds for it?

Vlad · 27th February 2015 at 18:49

Hello,

Doesn’t work at all

I’ve tried to Update Java, Download new Google Scholar PDF Metadata Retrieval Library, Clear all settings
Never get asked for captchas just says ‘Fetched 0 entries’

Brett · 17th March 2015 at 21:51

Similar to Vlad, I downloaded the new file and still have the problem. I have never been asked to enter a captcha. All I see is “Fetched 0 entries”.

I should clarify, with the new library the screen doesn’t even pop up. So I don’t see anything with the newer library.

Nicholas · 18th March 2015 at 11:20

I have the same problem as described by Vlad

einhander · 12th April 2015 at 20:52

It works, thanks.

johannes · 7th May 2015 at 12:02

Same problems as Vlad.

In my log file I find the fallowing message. Hope it helps

STDOUT: scholar.google.comhttpMay 05, 2015 9:44:15 AM org.docear.metadata.extractors.GoogleScholarExtractor search

INFO: scholar.google.comhttp
java.net.UnknownHostException: scholar.google.comhttp
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at sun.net.NetworkClient.doConnect(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.(Unknown Source)
at sun.net.www.http.HttpClient.New(Unknown Source)
at sun.net.www.http.HttpClient.New(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessController.doPrivileged(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source)
at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:439)
at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:424)
at org.jsoup.helper.HttpConnection.execute(HttpConnection.java:178)
at org.docear.metadata.extractors.GoogleScholarExtractor.search(GoogleScholarExtractor.java:76)
at org.docear.metadata.extractors.GoogleScholarExtractor.call(GoogleScholarExtractor.java:243)
at org.docear.metadata.extractors.GoogleScholarExtractor.call(GoogleScholarExtractor.java:1)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

johannes · 7th May 2015 at 12:02

Same problems as Vlad.

In my log file I find the fallowing message. Hope it helps

STDOUT: scholar.google.comhttpMay 05, 2015 9:44:15 AM org.docear.metadata.extractors.GoogleScholarExtractor search

INFO: scholar.google.comhttp
java.net.UnknownHostException: scholar.google.comhttp
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)
at sun.net.NetworkClient.doConnect(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.openServer(Unknown Source)
at sun.net.www.http.HttpClient.(Unknown Source)
at sun.net.www.http.HttpClient.New(Unknown Source)
at sun.net.www.http.HttpClient.New(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect0(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection$6.run(Unknown Source)
at java.security.AccessController.doPrivileged(Native Method)
at java.security.AccessController.doPrivileged(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(Unknown Source)
at sun.net.www.protocol.http.HttpURLConnection.connect(Unknown Source)
at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:439)
at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:424)
at org.jsoup.helper.HttpConnection.execute(HttpConnection.java:178)
at org.docear.metadata.extractors.GoogleScholarExtractor.search(GoogleScholarExtractor.java:76)
at org.docear.metadata.extractors.GoogleScholarExtractor.call(GoogleScholarExtractor.java:243)
at org.docear.metadata.extractors.GoogleScholarExtractor.call(GoogleScholarExtractor.java:1)
at java.util.concurrent.FutureTask.run(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor.runWorker(Unknown Source)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(Unknown Source)
at java.lang.Thread.run(Unknown Source)

Steve · 7th June 2015 at 02:25

Hi. Reporting success.
Google Scholar just recently started blocking automatic meta data retrieval. A few captchas were presented but no effect.
I followed your procedure and now it works again.
Thankyou very much.

Boyd Blackwell · 22nd June 2015 at 07:19

same error – is this a corrupt address? scholar.google.comhttp

The new library as per october 13th 2014 post worked once, no captchas, then stopped with the same error always.

STDOUT: Framework launched
STDOUT: REMINDERHOOK: org.freeplane.features.mode.mindmapmode.MModeController@1933db2Jun 22, 2015 4:15:57 PM org.freeplane.core.util.LogUtils info
INFO: requesting mode: MindMap
Jun 22, 2015 4:16:05 PM org.freeplane.core.util.LogUtils info
INFO: menu items to execute: []

STDOUT: scholar.google.comhttpJun 22, 2015 4:16:36 PM org.docear.metadata.extractors.GoogleScholarExtractor search
INFO: scholar.google.comhttp
java.net.UnknownHostException: scholar.google.comhttp
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)

Boyd Blackwell · 22nd June 2015 at 07:19

same error – is this a corrupt address? scholar.google.comhttp

The new library as per october 13th 2014 post worked once, no captchas, then stopped with the same error always.

STDOUT: Framework launched
STDOUT: REMINDERHOOK: org.freeplane.features.mode.mindmapmode.MModeController@1933db2Jun 22, 2015 4:15:57 PM org.freeplane.core.util.LogUtils info
INFO: requesting mode: MindMap
Jun 22, 2015 4:16:05 PM org.freeplane.core.util.LogUtils info
INFO: menu items to execute: []

STDOUT: scholar.google.comhttpJun 22, 2015 4:16:36 PM org.docear.metadata.extractors.GoogleScholarExtractor search
INFO: scholar.google.comhttp
java.net.UnknownHostException: scholar.google.comhttp
at java.net.AbstractPlainSocketImpl.connect(Unknown Source)
at java.net.PlainSocketImpl.connect(Unknown Source)
at java.net.SocksSocketImpl.connect(Unknown Source)
at java.net.Socket.connect(Unknown Source)

Edwin · 11th August 2015 at 07:29

Did not work.

Output before changing docear-metadata-lib-0.0.1.jar

11-Aug-2015 06:57:38 org.docear.metadata.extractors.GoogleScholarExtractor search
INFO: scholar.google.comhttp
java.net.UnknownHostException: scholar.google.comhttp
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:175)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:385)
at java.net.Socket.connect(Socket.java:546)
at sun.net.NetworkClient.doConnect(NetworkClient.java:173)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:427)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)
at sun.net.www.http.HttpClient.(HttpClient.java:213)
at sun.net.www.http.HttpClient.New(HttpClient.java:306)
at sun.net.www.http.HttpClient.New(HttpClient.java:325)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:955)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:891)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:809)
at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:439)
at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:424)
at org.jsoup.helper.HttpConnection.execute(HttpConnection.java:178)
at org.docear.metadata.extractors.GoogleScholarExtractor.search(GoogleScholarExtractor.java:74)
at org.docear.metadata.extractors.GoogleScholarExtractor.call(GoogleScholarExtractor.java:216)
at org.docear.metadata.extractors.GoogleScholarExtractor.call(GoogleScholarExtractor.java:1)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:701)

Output after changing docear-metadata-lib-0.0.1.jar

STDOUT: scholar.google.comhttp11-Aug-2015 07:19:36 org.docear.metadata.extractors.GoogleScholarExtractor search
INFO: scholar.google.comhttp
java.net.UnknownHostException: scholar.google.comhttp
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:175)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:385)
at java.net.Socket.connect(Socket.java:546)
at sun.net.NetworkClient.doConnect(NetworkClient.java:173)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:427)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)
at sun.net.www.http.HttpClient.(HttpClient.java:213)
at sun.net.www.http.HttpClient.New(HttpClient.java:306)
at sun.net.www.http.HttpClient.New(HttpClient.java:325)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:955)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:891)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:809)
at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:439)
at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:424)
at org.jsoup.helper.HttpConnection.execute(HttpConnection.java:178)
at org.docear.metadata.extractors.GoogleScholarExtractor.search(GoogleScholarExtractor.java:76)
at org.docear.metadata.extractors.GoogleScholarExtractor.call(GoogleScholarExtractor.java:243)
at org.docear.metadata.extractors.GoogleScholarExtractor.call(GoogleScholarExtractor.java:1)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:701)

I only have this problem at University, not at home. I wonder if this has to do with the fact that google scholar tells me what paper my University is subscribed to. Maybe this is to keep people from automatically fetching papers.

    Joeran [Docear] · 14th August 2015 at 14:50

    in a few days, we will release a new version of docear (please checkout our blog in a few days). that version has some improvements in pdf metadata extraction, which might solve your problem.

Edwin · 11th August 2015 at 07:29

Did not work.

Output before changing docear-metadata-lib-0.0.1.jar

11-Aug-2015 06:57:38 org.docear.metadata.extractors.GoogleScholarExtractor search
INFO: scholar.google.comhttp
java.net.UnknownHostException: scholar.google.comhttp
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:175)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:385)
at java.net.Socket.connect(Socket.java:546)
at sun.net.NetworkClient.doConnect(NetworkClient.java:173)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:427)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)
at sun.net.www.http.HttpClient.(HttpClient.java:213)
at sun.net.www.http.HttpClient.New(HttpClient.java:306)
at sun.net.www.http.HttpClient.New(HttpClient.java:325)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:955)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:891)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:809)
at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:439)
at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:424)
at org.jsoup.helper.HttpConnection.execute(HttpConnection.java:178)
at org.docear.metadata.extractors.GoogleScholarExtractor.search(GoogleScholarExtractor.java:74)
at org.docear.metadata.extractors.GoogleScholarExtractor.call(GoogleScholarExtractor.java:216)
at org.docear.metadata.extractors.GoogleScholarExtractor.call(GoogleScholarExtractor.java:1)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:701)

Output after changing docear-metadata-lib-0.0.1.jar

STDOUT: scholar.google.comhttp11-Aug-2015 07:19:36 org.docear.metadata.extractors.GoogleScholarExtractor search
INFO: scholar.google.comhttp
java.net.UnknownHostException: scholar.google.comhttp
at java.net.AbstractPlainSocketImpl.connect(AbstractPlainSocketImpl.java:175)
at java.net.SocksSocketImpl.connect(SocksSocketImpl.java:385)
at java.net.Socket.connect(Socket.java:546)
at sun.net.NetworkClient.doConnect(NetworkClient.java:173)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:427)
at sun.net.www.http.HttpClient.openServer(HttpClient.java:529)
at sun.net.www.http.HttpClient.(HttpClient.java:213)
at sun.net.www.http.HttpClient.New(HttpClient.java:306)
at sun.net.www.http.HttpClient.New(HttpClient.java:325)
at sun.net.www.protocol.http.HttpURLConnection.getNewHttpClient(HttpURLConnection.java:955)
at sun.net.www.protocol.http.HttpURLConnection.plainConnect(HttpURLConnection.java:891)
at sun.net.www.protocol.http.HttpURLConnection.connect(HttpURLConnection.java:809)
at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:439)
at org.jsoup.helper.HttpConnection$Response.execute(HttpConnection.java:424)
at org.jsoup.helper.HttpConnection.execute(HttpConnection.java:178)
at org.docear.metadata.extractors.GoogleScholarExtractor.search(GoogleScholarExtractor.java:76)
at org.docear.metadata.extractors.GoogleScholarExtractor.call(GoogleScholarExtractor.java:243)
at org.docear.metadata.extractors.GoogleScholarExtractor.call(GoogleScholarExtractor.java:1)
at java.util.concurrent.FutureTask$Sync.innerRun(FutureTask.java:334)
at java.util.concurrent.FutureTask.run(FutureTask.java:166)
at java.util.concurrent.ThreadPoolExecutor.runWorker(ThreadPoolExecutor.java:1146)
at java.util.concurrent.ThreadPoolExecutor$Worker.run(ThreadPoolExecutor.java:615)
at java.lang.Thread.run(Thread.java:701)

I only have this problem at University, not at home. I wonder if this has to do with the fact that google scholar tells me what paper my University is subscribed to. Maybe this is to keep people from automatically fetching papers.

    Joeran [Docear] · 14th August 2015 at 14:50

    in a few days, we will release a new version of docear (please checkout our blog in a few days). that version has some improvements in pdf metadata extraction, which might solve your problem.

Drew Thayer · 28th September 2015 at 18:06

I just tried this (replacing the downloaded file in the recommended folder path) and it works. Thanks.

Drew Thayer · 28th September 2015 at 18:06

I just tried this (replacing the downloaded file in the recommended folder path) and it works. Thanks.

Dan · 19th February 2016 at 15:45

The file is not available, is that normal ? (working on v1.2)

    Joeran [Docear] · 28th February 2016 at 09:56

    you don’t need the file any more, it’s included in Docear 1.2

      Kelly · 5th September 2016 at 14:10

      I have downloaded Docear 1.2 and am also having trouble with retrieving metadata either through the google search or the XML function. Please advise.

Dan · 19th February 2016 at 15:45

The file is not available, is that normal ? (working on v1.2)

Hidayet Tutun · 11th April 2016 at 19:57

Hı,
I am using new version of Docear, but, Metadata extraction is not working. you said it was included in Docear 1.2. it did not work, what should we do to work again maetadata extraction.

Hidayet Tutun · 11th April 2016 at 19:57

Hı,
I am using new version of Docear, but, Metadata extraction is not working. you said it was included in Docear 1.2. it did not work, what should we do to work again maetadata extraction.

Urvashi · 21st April 2016 at 03:13

Downloaded the latest version. It worked fine for a while, but then started having the same issues as the previous version for retrieving articles. What to do?

Urvashi · 21st April 2016 at 03:13

Downloaded the latest version. It worked fine for a while, but then started having the same issues as the previous version for retrieving articles. What to do?

Angus · 27th June 2016 at 14:25

I’m having the same problem. I used Docear just long enough to fall in love with this feature and now it has stopped retrieving articles. I’d love a suggestion as to how to move forward.

Angus · 27th June 2016 at 14:25

I’m having the same problem. I used Docear just long enough to fall in love with this feature and now it has stopped retrieving articles. I’d love a suggestion as to how to move forward.

Sanket Gupte · 27th August 2016 at 14:41

I am having the same problem now. I am so much addicted to retrieving the references easily, that the alternative is really cumbersome.

janewaite · 16th September 2016 at 15:18

I am having the same problem. Please can someone help?

janewaite · 16th September 2016 at 15:18

I am having the same problem. Please can someone help?

janewaite · 17th September 2016 at 17:51

Again help!!

janewaite · 17th September 2016 at 17:51

Again help!!

Nicole · 14th July 2017 at 07:49

I cannot retrieve metadata, it keeps searching and never finishes. Please help solve this problem with metadata retrieval. It worked before but has now stopped working.

    Joeran [Docear] · 15th July 2017 at 01:36

    I am sorry, we don’t have the capacity to do any changes on the meta data retrieval. If it doesn’t work (any more), I am afraid you need to manually import the data e.g. from Google Scholar (you can search on Google Scholar for the paper, and then copy and paste the BibTeX code from Google Scholar to Docear).

Nicole · 14th July 2017 at 07:49

I cannot retrieve metadata, it keeps searching and never finishes. Please help solve this problem with metadata retrieval. It worked before but has now stopped working.

    Joeran [Docear] · 15th July 2017 at 01:36

    I am sorry, we don’t have the capacity to do any changes on the meta data retrieval. If it doesn’t work (any more), I am afraid you need to manually import the data e.g. from Google Scholar (you can search on Google Scholar for the paper, and then copy and paste the BibTeX code from Google Scholar to Docear).

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