http://ru.wikipedia.org/wiki/%D0%9A%D1%80%D1%8B%D0%BC%D1%81%D0%BA%D0%BE%D0%B5_%D1%85%D0%B0%D0%BD%D1%81%D1%82%D0%B2%D0%BE тыц =)
ну и еще один тыц http://ru.wikipedia.org/wiki/%D0%94%D0%B5%D0%BF%D0%BE%D1%80%D1%82%D0%B0%D1%86%D0%B8%D1%8F_%D0%BA%D1%80%D1%8B%D0%BC%D1%81%D0%BA%D0%B8%D1%85_%D1%82%D0%B0%D1%82%D0%B0%D1%80