By Bugrij A.   Lisovyy O.   in Journal of Experimental and Theoretical Physics

ISSN:1063-7761|94|6|1140-1148

MAIK Nauka/Interperiodica‎(2002)‎

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By Gavrylenko P.   Iorgov N.   Lisovyy O.   in Journal of Physics A: Mathematical and Theoretical

ISSN:1751-8121|45|2|25402-25419

IOP Publishing‎(2012)‎

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By Iorgov N.   Lisovyy O.   Shchechkin A.   Tykhyy Y.   in Constructive Approximation

ISSN:0176-4276|39|1|255-272

Springer Publishing Company ‎(2014)‎

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