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ISSN:1072-3374|191|1|28-30

Springer Publishing Company ‎(2013)‎

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By Vorontsov Yu.   Ikramov Kh.   in Computational Mathematics and Mathematical Physics

ISSN:0965-5425|54|3|379-381

MAIK Nauka/Interperiodica‎(2014)‎

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