References
P. M. Cohn,Algebra, Volume Two, John Wiley and Sons (1977).
O. Steinfeld,Quasi-ideals in rings and semigroups, Akadémiai Kiadó, (1978).
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This research was done at the University of Leicester. The author is grateful for the hospitality of that University and acknowledges the support of NSERC grant # A-8789.
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Stewart, P.N. Quasi-ideals in rings. Acta Mathematica Academiae Scientiarum Hungaricae 38, 231–235 (1981). https://doi.org/10.1007/BF01917537
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DOI: https://doi.org/10.1007/BF01917537