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Czechoslovak Journal of Physics > 2004 > 54 > 11 > 1199-1207
Journal of Geometry and Physics > 2003 > 48 > 4 > 580-634
Journal of Geometry and Physics > 2002 > 42 > 3 > 216-258
Czechoslovak Journal of Physics > 2004 > 54 > 11 > 1199-1207
Journal of Geometry and Physics > 2003 > 48 > 4 > 580-634
Journal of Geometry and Physics > 2002 > 42 > 3 > 216-258