Analysis of information sources in references of the Wikipedia article "%D0%97%D0%B0%D1%81%D0%BE%D1%81%D0%BD%D0%B0 (%D0%92%D0%BE%D1%80%D0%BE%D0%BD%D0%B5%D0%B6%D1%81%D0%BA%D0%B0%D1%8F %D0%BE%D0%B1%D0%BB%D0%B0%D1%81%D1%82%D1%8C)" in Russian language version.
