Analysis of information sources in references of the Wikipedia article "%D0%9F%D1%80%D0%B0%D0%B2%D0%BE%D1%81%D0%BB%D0%B0%D0%B2%D0%BD%D0%B0%D1%8F %D0%B8%D0%BA%D0%BE%D0%BD%D0%BE%D0%B3%D1%80%D0%B0%D1%84%D0%B8%D1%8F %D0%91%D0%BE%D0%B3%D0%BE%D1%80%D0%BE%D0%B4%D0%B8%D1%86%D1%8B" in Russian language version.
