By Zelenova S.   in Journal of Mathematical Sciences

ISSN:1072-3374|134|1|1879-1909

Springer Publishing Company ‎(2006)‎

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By Zelenov S.   Zelenova S.   in Programming and Computer Software

ISSN:0361-7688|31|6|310-320

MAIK Nauka/Interperiodica‎(2005)‎

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