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1.http://z3950.ksu.ru/full_fond/books/klass/005/288-352.pdf
2.http://ru.wikipedia.org/wiki/%D0%9A%D0%BE%D0%BD%D1%82,_%D0%9E%D0%B3%D1%8E%D1%81%D1%82
3. http://slovari-online.ru/word/%D1%81%D0%BE%D1%86%D0%B8%D0%BE%D0%BB%D0%BE%D0%B3%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B8%D0%B9-%D1%81%D0%BB%D0%BE%D0%B2%D0%B0%D1%80%D1%8C/%D0%BE-%D0%BA%D0%BE%D0%BD%D1%82-%D0%BA%D0%B0%D0%BA-%D1%81%D0%BE%D0%B7%D0%B4%D0%B0%D1%82%D0%B5%D0%BB%D1%8C-%D1%81%D0%BE%D1%86%D0%B8%D0%BE%D0%BB%D0%BE%D0%B3%D0%B8%D0%B8.htm
4.http://ru.wikipedia.org/wiki/%D0%A1%D0%BE%D1%86%D0%B8%D0%BE%D0%BB%D0%BE%D0%B3%D0%B8%D1%8F