1. On a Problem of M. Kambites Regarding Abundant Semigroups
2. Batbedat , A. ( 1981 ).γ-demi-groups, demi-modules, produit demi-directs.In Semigroups, Proceedings, Oberwolfalch, Germany 1978, Lecture Notes in Mathematics, Vol. 855. Springer-Verlag, pp. 1–18 .
3. Berberian , S. K. ( 2003 ). Baer rings and Baer *-rings. The University of Texas at Austin, Registered U.S. Copyright Office March 1988, revised edition .
4. Bredikhin , D. A. ( 1977 ).Abstract characterisation of some classes of binary relation algebras.In Algebra and Number Theory. (In Russian) Vol. 2, Kabardino-Balkarsk. Gos. Univ., Nalchik, pp. 3–19 .
5. Restriction categories I: categories of partial maps