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@article{SF_1975__10_134120, author = {T.E. Hall and D.W.H. Gillam and N.H. Williams}, title = {An addition theorem for finite semigroups.}, journal = {Semigroup forum}, pages = {273--276}, publisher = {mathdoc}, volume = {10}, year = {1975}, zbl = {0324.20074}, url = {http://geodesic.mathdoc.fr/item/SF_1975__10_134120/} }
T.E. Hall; D.W.H. Gillam; N.H. Williams. An addition theorem for finite semigroups.. Semigroup forum, Tome 10 (1975), pp. 273-276. http://geodesic.mathdoc.fr/item/SF_1975__10_134120/