Constructing the maximal monoids in the semigroups ${𝒩}_n,{𝒮}_n$, and ${\Omega }_n$

Hartfiel, D. J.; Maxson, C. J.

Compositio Mathematica, Volume 32 (1976) p. 41-52

On well-ordered groups and near-rings

Maxson, Carlton J.

Compositio Mathematica, Volume 22 (1970) p. 241-244