Journal of Geometry and Physics
Journal of Geometry and Physics > 1996 > 20 > 1 > 87-105
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 > 1997 > 22 > 1 > 14-58
Journal of Geometry and Physics > 1997 > 22 > 4 > 298-318