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Journal of Geometry and Physics > 2004 > 51 > 1 > 71-81
Journal of Geometry and Physics > 2003 > 46 > 3-4 > 255-282
Journal of Geometry and Physics > 2002 > 42 > 3 > 216-258
Journal of Geometry and Physics > 2000 > 36 > 1-2 > 22-59