By Gubreev G.M.   in Functional Analysis and Its Applications

ISSN:0016-2663|35|2|142-145

Springer Publishing Company ‎(2001)‎

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By Gubreev G. M.   Volkova M. G.   in Journal of Mathematical Sciences

ISSN:1072-3374|124|2|4861-4866

Springer Publishing Company ‎(2004)‎

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