1. The extended centralizer of a ring over a module;Johnson;Proc. Amer. Math. Soc.,1951
2. Structure theory of faithful rings;Johnson;Trans. Amer. Math. Soc.,1957
3. Self-injective rings;Wong;Can. Math. Bull.,1959
4. On a theorem on modular lattices;Utumi;Proc. of the Japan Academy,1959
5. On quotient rings;Utumi;Osaka Mathematical Journal,1956