By Orlovskii D.   Piskarev S.   in Differential Equations

ISSN:0012-2661|49|7|895-907

MAIK Nauka/Interperiodica‎(2013)‎

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By Vasil'ev V. V.   Piskarev S. I.   in Journal of Mathematical Sciences

ISSN:1072-3374|122|2|3055-3174

Springer Publishing Company ‎(2004)‎

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