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Journal of Geometry and Physics > 2003 > 47 > 1 > 1-20
Linear Algebra and Its Applications > 2003 > 361 > Complete > 223-243
Journal of Computational and Applied Mathematics > 2001 > 131 > 1-2 > 161-174
Journal of Geometry and Physics > 2001 > 37 > 1-2 > 63-93
Journal of Geometry and Physics > 2000 > 36 > 1-2 > 60-102