By Komarov A.   Penkin O.   in Journal of Mathematical Sciences

ISSN:1072-3374|133|1|883-902

Springer Publishing Company ‎(2006)‎

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By Penkin O. M.   in Journal of Mathematical Sciences

ISSN:1072-3374|119|6|836-867

Springer Publishing Company ‎(2004)‎

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By Gavrilov A.   Penkin O.   in Journal of Mathematical Sciences

ISSN:1072-3374|142|3|2079-2084

Springer Publishing Company ‎(2007)‎

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By Gots E.   Penkin O.   in Journal of Mathematical Sciences

ISSN:1072-3374|126|6|1630-1642

Springer Publishing Company ‎(2005)‎

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By Kulyaba V. V.   Penkin O. M.   in Differential Equations

ISSN:0012-2661|40|1|75-82

MAIK Nauka/Interperiodica‎(2004)‎

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