1. Representation Theory of Finite Groups and Associative Algebras;Curtis,1962
2. Noncommutative Rings;Herstein,1968
3. Cocommutative Hopf algebras;Larson;Canad. J. Math.,1967
4. The order of the antipode of a Hopf algebra;Larson,1969
5. An associative orthogonal bilinear form for Hopf algebras;Larson;Amer. J. Math.,1969