1. Baird, G. R.,On semigroups and uniform partial bands, Semigroup Forum 4 (1972), 185–188.
2. Clifford, A. H.,The fundamental representation of a regular semigroup, Dept. of Math., Tulane Univ. (1974), 65 pp. (Available on request to the author)
3. —,The fundamental representation of a regular semigroup, Semigroup Forum
4. —,The partial groupoid of idempotents of a regular semigroup, Dept. of Math., Tulane Univ. (1974), 43 pp. (Available on request to the author.)
5. Grillet, P. A. and K. S. S. Nambooripad,On biordered sets, warps and cross-connections, to be submitted for publication.