By Sabitov I.   in Doklady Mathematics

ISSN:1064-5624|82|2|722-725

MAIK Nauka/Interperiodica‎(2010)‎

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By Maksimov I.G.   Sabitov I.K.   in Siberian Mathematical Journal

ISSN:0037-4466|43|4|661-673

Springer Publishing Company ‎(2002)‎

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