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Journal of Geometry and Physics > 1997 > 22 > 4 > 298-318
Journal of Geometry and Physics > 1996 > 20 > 4 > 349-370
Journal of Geometry and Physics > 1996 > 20 > 4 > 305-317
Journal of Geometry and Physics > 1996 > 20 > 1 > 87-105