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ISSN:1064-5624|83|3|344-347

MAIK Nauka/Interperiodica‎(2011)‎

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By Alestalo P.   Trotsenko D. A.   Vaisala J.   in Siberian Mathematical Journal

ISSN:0037-4466|44|6|959-968

Springer Publishing Company ‎(2003)‎

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