1. Bourbaki, N.Éléments de Mathématiques XXX, “Algèbre Commutative.” Chap. 6, Valuations.
2. Twisted group algebras and their representations;Conlon;J. Austral. Math. Soc.,1964
3. Structure in representation algebras;Conlon;J. Algebra,1967
4. Representation Theory of Finite Groups and Associative Algebras;Curtis,1962
5. Die Theorie der Automorphismenringe Abelscher Gruppen und ihr Analogon bei nicht kommutativen Gruppen;Fitting;Math. Ann.,1932