http://institutional.narod.ru/lectures/lectures8.htm
https://portal.sibadi.org/pluginfile.php/102315/mod_resource/content/0/%D0%9B%D0%B5%D0%BA%D1%86%D0%B8%D1%8F%204_%20%D0%A2%D0%B5%D0%BE%D1%80%D0%B8%D1%8F%20%D1%8D%D0%BA%D0%BE%D0%BD%D0%BE%D0%BC%D0%B8%D1%87%D0%B5%D1%81%D0%BA%D0%B8%D1%85%20%D0%BE%D1%80%D0%B3%D0%B0%D0%BD%D0%B8%D0%B7%D0%B0%D1%86%D0%B8%D0%B9.pdf
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