1. Second;Benson D.,1998
2. Chin, W. 1997. “A Brief Introduction to Coalgebra Representation Theory”. Edited by: Green, E., Bautista, R. and Martinez, R. Michoacan: Conf. Proc. Morelia. (to appear)
3. 1993. “Hopf Algebras and Their Actions on Rings”. Providence, RI: American Mathematical Society. CBMS Regional Conference Series in Mathematics, 82