By Shuvar B.   Kopach M.   in Differential Equations

ISSN:0012-2661|42|4|586-590

MAIK Nauka/Interperiodica‎(2006)‎

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By Shuvar B.   Mentyns’kyi S.   in Ukrainian Mathematical Journal

ISSN:0041-5995|57|2|340-345

Springer Publishing Company ‎(2005)‎

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