1. Bell, H.E.: Commutativity in ring semigroups. In: Words, Languages and Combinatorics, II, Kyoto, 1992, pp. 24–31. World Scientific, Singapore (1994)
2. Dugas, M., Mader, A., Vinsonhaler, C.: Large E-rings exist. J. Algebra 108(1), 88–101 (1987)
3. Fuchs, L.: Abelian Groups. Publishing House of the Hungarian Academy of Sciences, Budapest (1958)
4. Gilmer, R.: Finite rings having a cyclic multiplicative group of units. Am. J. Math. 85, 447–452 (1963)
5. Göbel, R., Herden, D., Shelah, S.: Absolute E-rings. Adv. Math. 226(1), 235–253 (2011)