1. γ-Demi-groups, demi-modules, produit demi-directs;Batbedat,1981
2. Abstract characterisation of some classes of binary relation algebras;Bredikhin,1977
3. A Course in Universal Algebra;Burris,1980
4. The finite basis problem for quasivarieties and pseudovarieties generated by regular semigroups I. Quasivarieties generated by regular semigroups;Cowan;J. Algebra,2003
5. Introduction to Lattices and Order;Davey,2002