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@article{SF_1984__30_134717, author = {K.D. jr. Magill}, title = {Semigroups for which the continuum congruences form finite chains.}, journal = {Semigroup forum}, pages = {221--230}, publisher = {mathdoc}, volume = {30}, year = {1984}, zbl = {0533.20037}, url = {http://geodesic.mathdoc.fr/item/SF_1984__30_134717/} }
K.D. jr. Magill. Semigroups for which the continuum congruences form finite chains.. Semigroup forum, Tome 30 (1984), pp. 221-230. http://geodesic.mathdoc.fr/item/SF_1984__30_134717/