1. B. B. Baird, Isomorphisms between inverse semigroups of injective transformations,J. Australian Math. Soc.,XXIII, Series A, part 2 (1977), 199–201.
2. A. Bigard, K. Keimel and S. Wolfenstein,Groups et Anneaux Réticulés, Lecture Notes in Mathematics, Vol.608 (Springer Verlag, 1977).
3. Z. I. Borevich and I. R. Shafaverich,Number Theory (Academic Press, 1966).
4. R. B. Mura and A. Rhemtulla,Orderable Groups, Lecture Notes in Pure and Applied Math., Vol.27 (Dekker, 1977).
5. A. H. Clifford and G. B. Preston,Algebraic Theory of Semigroups, Math. Surveys of the Amer. Math. Soc. 7, Vol.1 (Providence, 1961) and Vol. 2 (Providence, 1967).