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A. H. Clifford, Semigroups without nilpotent ideals, Amer. J. Math. vol. 71 (1949) pp. 834-844. MR 0032661 (11:327b)

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R. A. Good and D. R. Hughes, Associated groups for a semigroup, Bull. Amer. Math. Soc. Abstract 58-6-575.

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R. J. Koch, On topological semigroups, Tulane University Dissertation, 1953.

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R. J. Koch and A. D. Wallace, Maximal ideals in topological semigroups (to appear in Duke Math J.)

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K. Numakura, On bicompact semigroups, Mathematical Journal of Okayama University vol. 1 (1952) pp. 99-108. MR 0048467 (14:18g)

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-, On bicompact semigroups with zero, Bulletin of the Yamagata University no. 4 (1951) pp. 405-411. MR 0065568 (16:447c)

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D. Rees, On semigroups, Proc. Cambridge Philos. Soc. vol. 36 (1940) pp. 387-400. MR 0002893 (2:127g)

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R. P. Rich, Completely simple ideals of a semigroup, Amer. J. Math. vol. 71 (1949) pp. 883-885. MR 0032662 (11:327c)

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A. D. Wallace, A note on mobs II, Anais da Academia Brasileira de Ciencias vol. 25 (1953) pp. 335-336. MR 0061612 (15:854a)