By Boichuk A.   Korostil I.   Fečkan M.   in Differential Equations

ISSN:0012-2661|43|4|495-502

MAIK Nauka/Interperiodica‎(2007)‎

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By Krupa N.   Korostil' A.   Skirta Yu.   in Radiophysics and Quantum Electronics

ISSN:0033-8443|48|8|599-606

Springer Publishing Company ‎(2005)‎

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