Preprints

   1. Polynomial invariants for a semisimple and cosemisimple Hopf algebra of finite dimension, February 12, 2009 (revised August 27, 2009)  pdf_file

   1. Fusion algebras for orbifold models

   2. On the quasitriangular structures of the group Hopf algebra of a non-abelian group

   1. (in preparation)