См. <a href="http://ru.m.wikipedia.org/wiki/%D0%98%D1%81%D1%81%D0%B5%D0%B4%D0%BE%D0%BD%D1%8B" target="_blank" rel="nofollow">здесь</a> и <a href="http://ru.m.wikipedia.org/wiki/%D0%90%D1%80%D0%B8%D0%BC%D0%B0%D1%81%D0%BF%D1%8B" target="_blank" rel="nofollow">здесь</a>
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