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Serge Gnabry Sergej Milinković-Savić Sergey Aleksandrovich Yesenin Sergey Pavlovich Korolyov Sergey Sergeyevich Prokofyev Sergei Vasilievich Rachmaninoff Sergey Brin Sergey Kuzhugetovich Shoygu Sergei Leonidovich Magnitsky Sergey KarjakinTài liệu tham khảo
WikiPedia: Sergei_Adamovich_Kovalev http://books.google.com/books?hl=en&lr=&id=QlJNt_1... http://www.nybooks.com/articles/225 http://web.amnesty.org/library/Index/ENGEUR4601320... http://www.ned.org/events/demaward/demaward1995.ht... http://www.svoboda.org/programs/ftf/2004/ftf.12120... http://old.grani.ru/civil_society/articles/kovalev... http://old.grani.ru/fsb/articles/kovalyov_commissi... http://www.hrights.ru/kovalyov.htm http://2006.novayagazeta.ru/nomer/2006/82n/n82n-s0... http://eng.terror99.ru/publications/107.htm