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Bibliography

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A. D. Wallace, The structure of topological semigroups, Bull. Amer. Math. Soc. vol. 61 (1955) pp. 95-112. MR 0067907 (16:796d)

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P. S. Mostert and A. L. Shields, On the structure of semigroups on a compact manifold with boundary, to appear in Ann. of Math. MR 0084103 (18:809c)

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D. Montgomery and L. Zippin, A class of transformation groups in , Amer. J. Math. vol. 65 (1943) pp. 601-608. MR 0009447 (5:151g)