By Kirpichnikova N.   Svirkina L.   Philippov V.   in Journal of Mathematical Sciences

ISSN:1072-3374|127|6|2396-2401

Springer Publishing Company ‎(2005)‎

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By Kirpichnikova N. Ya.   Svirkina L. A.   Filippov V. B.   in Journal of Mathematical Sciences

ISSN:1072-3374|122|5|3502-3513

Springer Publishing Company ‎(2004)‎

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