By Frank L. A.   Petunin A. I.   Vysotski E. S.   in Russian Journal of Bioorganic Chemistry

ISSN:1068-1620|30|4|327-331

MAIK Nauka/Interperiodica‎(2004)‎

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By Klyushin D. A.   Petunin Yu. I.   in Ukrainian Mathematical Journal

ISSN:0041-5995|55|2|181-198

Springer Publishing Company ‎(2003)‎

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