REFERENCES
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- Lam , T. Y. ( 1991 ). A First Course in Noncommutative Rings . Grad. Texts in Math. , Vol. 131 . Berlin : Springer-Verlag .
- Shepherdson , J. C. ( 1951 ). Inverses and zero divisors in matrix rings . Proc. London Math, Soc. 1 : 71 – 85 .
- Communicated by E. R. Puczylowski.