1. Rings with duals;Baer;Amer. J. Math.,1943
2. Non-Commutative rings with primary decomposition;Chatters;Quart. J. Math. Oxford (2),1971
3. Representation Theory of Finite Groups and Associative Algebras;Curtis,1962
4. A type of algebraic closure;Hall;Ann. of Math.,1939
5. Some generalisations of quasi-Frobenius rings;Ikeda;Osaka Math. J.,1951