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Bibliography

[1]

A. H. Clifford, Connected ordered topological semigroups with idempotent endpoints. I, Trans. Amer. Math. Soc. 88 (1958), 80-98. MR 0095221 (20:1727)

[2]

-, Connected ordered topological semigroups with idempotent endpoints. II, Trans. Amer. Math. Soc. 91 (1959), 193-208. MR 0105462 (21:4203)

[3]

-, Extensions of semigroups, Trans. Amer. Math. Soc. 68 (1950), 165-173. MR 0033836 (11:499d)

[4]

Haskell Cohen and L. I. Wade, Clans with zero on an interval, Trans. Amer. Math. Soc. 88 (1958), 523-535. MR 0095222 (20:1728)

[5]

P. S. Mostert and A. L. Shields, On the structure of semigroups on a compact manifold with boundary, Ann. of Math. 65 (1957), 117-143. MR 0084103 (18:809c)

[6]

C. R. Storey, The structure of threads, Pacific J. Math. 10 (1960), 1429-1445. MR 0118777 (22:9548)

[7]

A. D. Wallace, Inverses in Euclidean mobs, Math. J. Okayama Univ. 3 (1953), 23-28. MR 0062137 (15:933d)

[8]

-, A note on mobs, An. Acad. Brasil. Ci. 24 (1952), 329-334. MR 0053120 (14:724d)