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Analysis of information sources in references of the Wikipedia article "Henrik Koppel" in Estonian language version.
![[1]](http://www.ra.ee/dgs/browser.php?tid=68&iid=110700202672&img=era0031_001_0000216_00033_t.jpg&tbn=1&pgn=2&prc=30&ctr=0&dgr=0&lst=2&hash=62afb339400fd038b4200bd3910d4906){kind=link}
![[2]](http://www.ra.ee/dgs/browser.php?tid=68&iid=110700242289&img=era0031_005_0000332_00006_t.jpg&tbn=1&pgn=1&prc=30&ctr=0&dgr=0&lst=2&hash=59c1e9db3f41b4df77c5c5dcdc433566){kind=link}