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@article{SF_1974__6_133983, author = {T.E. Hall}, title = {The partially ordered set of all {J-classes} of a finite semigroup.}, journal = {Semigroup forum}, pages = {263--264}, publisher = {mathdoc}, volume = {6}, year = {1974}, zbl = {0263.06005}, url = {http://geodesic.mathdoc.fr/item/SF_1974__6_133983/} }
T.E. Hall. The partially ordered set of all J-classes of a finite semigroup.. Semigroup forum, Tome 6 (1974), pp. 263-264. http://geodesic.mathdoc.fr/item/SF_1974__6_133983/