By Abramov A. A.   Ul'yanova V. I.   Yukhno L. F.   in Differential Equations

ISSN:0012-2661|40|7|954-958

MAIK Nauka/Interperiodica‎(2004)‎

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By Abramov A. A.   Balla K.   Ul'yanova V. I.   Yukhno L. F.   in Differential Equations

ISSN:0012-2661|39|7|913-925

MAIK Nauka/Interperiodica‎(2003)‎

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