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Y. Utumi, On rings of which any one-sided quotient rings are two-sided, Proc. Amer. Math. Soc. 14 (1963), 141-147. MR 0142568 (26:137)

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-, A note on rings of which any one-sided quotient rings are two-sided, Proc. Japan Acad. 39 (1963), 287-288. MR 0186695 (32:4153)

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R. E. Johnson, Quotient rings of rings with zero singular ideal, Pacific J. Math. 11 (1961), 1385-1392. MR 0143779 (26:1331)

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-, Structure theory of faithful rings. II, Trans. Amer. Math. Soc. 84 (1957), 523-544.

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J. Levitzki, On multiplicative systems, Compositio Math. 8 (1950), 76-80. MR 0033799 (11:489f)

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K. G. Wolfson, An ideal-theoretic characterization of the ring of all linear transformations, Amer. J. Math. 75 (1953), 358-386. MR 0053080 (14:718f)

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N. Jacobson, Structure of rings, Amer. Math. Soc. Colloq. Publ. Vol. 37, Amer. Math. Soc., Providence, R. I., 1956. MR 0081264 (18:373d)