1. Semigroup theory
2. Completely 0-simples semigroups
3. Regular semigroups
4. Inverse semigroups
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Higgins, Peter M.(4-ESSX)
Techniques of semigroup theory.
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Howie, John M.
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London Mathematical Society Monographs. New Series, 12. Oxford Science Publications. The Clarendon Press, Oxford University Press, New York, 1995. x+351 pp.
Petrich, Mario Inverse semigroups. Pure and Applied Mathematics (New York). A Wiley-Interscience Publication. John Wiley & Sons, Inc., New York, 1984. x+674 pp.
Rhodes, John; Steinberg, Benjamin The q-theory of finite semigroups. Springer Monographs in Mathematics. Springer, New York, 2009. xxii+666 pp.
E-learning.