http://ru.wikipedia.org/wiki/%D0%9C%D0%B5%D0%BB%D1%8C%D0%BD%D0%B8%D1%87%D0%B5%D0%BD%D0%BA%D0%BE,_%D0%90%D0%BD%D0%B4%D1%80%D0%B5%D0%B9_%D0%98%D0%B3%D0%BE%D1%80%D0%B5%D0%B2%D0%B8%D1%87