Search results
Advances in Mathematics > 2003 > 175 > 2 > 197-242
Journal of Geometry and Physics > 2002 > 44 > 2-3 > 129-155
Journal of Geometry and Physics > 2002 > 42 > 3 > 259-282
Journal of Geometry and Physics > 1999 > 31 > 4 > 241-264