Journal of Geometry and Physics
Journal of Geometry and Physics > 1995 > 15 > 2 > 150-158
Journal of Geometry and Physics > 1995 > 15 > 4 > 320-332
Journal of Geometry and Physics > 1995 > 16 > 2 > 120-148
Journal of Geometry and Physics > 1997 > 23 > 3-4 > 308-318
Journal of Geometry and Physics > 1997 > 23 > 3-4 > 206-234