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Journal of Geometry and Physics > 2000 > 36 > 1-2 > 126-139
Engineering Transactions > 1998 > Vol. 46, iss. 2 > 143-164
Journal of Geometry and Physics > 2000 > 36 > 1-2 > 126-139
Engineering Transactions > 1998 > Vol. 46, iss. 2 > 143-164