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@article{SF_1990__41_2_135049, author = {D. Davenport}, title = {The minimal ideal of compact subsemigroups of {\ss} {S.}}, journal = {Semigroup forum}, pages = {201--214}, publisher = {mathdoc}, volume = {41}, number = {2}, year = {1990}, zbl = {0842.22001}, url = {http://geodesic.mathdoc.fr/item/SF_1990__41_2_135049/} }
D. Davenport. The minimal ideal of compact subsemigroups of ß S.. Semigroup forum, Tome 41 (1990) no. 2, pp. 201-214. http://geodesic.mathdoc.fr/item/SF_1990__41_2_135049/