By Dynnikov I.A.   in Acta Applicandae Mathematicae

ISSN:0167-8019|69|3|243-283

Springer Publishing Company ‎(2001)‎

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By Dynnikov I.   Maltsev A.   in Journal of Experimental and Theoretical Physics

ISSN:1063-7761|85|1|205-208

MAIK Nauka/Interperiodica‎(1997)‎

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