Journal of Geometry and Physics
Journal of Geometry and Physics > 1995 > 15 > 4 > 320-332
Journal of Geometry and Physics > 1995 > 15 > 4 > 353-368
Journal of Geometry and Physics > 1995 > 15 > 4 > 369-380
Journal of Geometry and Physics > 1995 > 15 > 4 > 333-352
Journal of Geometry and Physics > 1995 > 15 > 4 > 285-319