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Journal of Geometry and Physics > 1999 > 30 > 1 > 23-47
Journal of Geometry and Physics > 1999 > 30 > 2 > 113-146
Journal of Computational and Applied Mathematics > 1996 > 68 > 1-2 > 197-207
Journal of Geometry and Physics > 1999 > 30 > 1 > 23-47
Journal of Geometry and Physics > 1999 > 30 > 2 > 113-146
Journal of Computational and Applied Mathematics > 1996 > 68 > 1-2 > 197-207