Skew lattices in rings

Dilworth, R. P.,Lattices with unique complements, Trans. AMS,57 (1945), pp. 123?54.

Gerhardts, M. D.,Zur Charakterisierung distributiver Schiefverb�nde, Math Ann.,161 (1965), pp. 231?240.

Gerhardts, M. D.,Schr�gverb�nde und Quasiordnungen, Math. Ann.,181 (1969), pp. 65?73.

Howie, J. M.,An Introduction to Semigroup Theory, Academic Press, 1976.

Jordan, P.,Uber nichtkommutative Verbande, Arch. Math.,2 (1949), pp. 56?59.

Jordan, P.,Halbgruppen von Idempotenten und nichtkommutative Verb�nde, J. reine angew. Math.,211 (1962), pp. 136?161.

Leech, J. E.,Normal Skew Lattices, Semigroup Forum, to appear.

Leech, J. E.,Primitive Skew Lattices and Completely Simple Semigroups, submitted.

Leech, J. E.,Skew Lattices of Partial Functions, Algebra Universalis, to appear.

Petrich, M.Lectures on Semigroups, John Wiley and Sons, 1977.

Schein, B.,Pseudosemilattices and Pseudolattices, Amer. Math. Soc. Transl. (2),119 (1983), pp. 1?16.

Schweigert, D.,Near Lattices, Math. Slovaca,23 (1982), pp. 313?317.

Schweigert, D.,Distributive Associative Near Lattices, Math. Slovaca,35 (1985), pp. 313?317.