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подробности здесь: http://uk.wikipedia.org/wiki/%D0%A5%D1%80%D0%B0%D0%BC_%D0%A3%D1%81%D0%BF%D1%96%D0%BD%D0%BD%D1%8F_%D0%9F%D1%80%D0%B5%D1%81%D0%B2%D1%8F%D1%82%D0%BE%D1%97_%D0%91%D0%BE%D0%B3%D0%BE%D1%80%D0%BE%D0%B4%D0%B8%D1%86%D1%96_(%D0%93%D0%BE%D1%80%D0%B0_%D0%A1%D1%96%D0%BE%D0%BD)