Extensions of completely 0-simple semigroups by completely
-  A. H. Clifford and G. B. Preston, The algebraic theory of semigroups. Vol. I, Mathematical Surveys, No. 7, American Mathematical Society, Providence, R.I., 1961. MR 0132791
-  Gérard Lallement and Mario Petrich, Some results concerning completely 0-simple semigroups, Bull. Amer. Math. Soc. 70 (1964), 77-778.
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