참고문헌
- Y. U. Cho Quotient substructures of R-groups, J Applied Mathematics and Informatics 28 No 1-2, (2010), 345-349.
- J.D.P. Meldrum Upper faithful D.G. near-rings, Proc. Edinburgh Math. Soc. 26, (1983), 361-370. https://doi.org/10.1017/S0013091500004430
- G. Pilz Near-rings, , North Holland Publishing Company, Amsterdam, New York, Ox-ford 1983.