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R. E. Johnson, The extended centralizer of a ring over a modvle, Proc. Amer. Math. Soc. 2 (1951), 891-895. MR 0045695 (13:618c)

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Y. Utumi, On quotient rings, Osaka Math. J. 8 (1956), 1-18. MR 0078966 (18:7c)

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-, On continuous regular rings and semisimple self injective rings, Canad. J. Math. 12 (1960), 597-605. MR 0117250 (22:8032)

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-, On continuous regular rings, Canad. Math. Bull. 4 (1961), 63-69. MR 0125130 (23:A2436)