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@article{SF_1985__31_134738, author = {J.E. Mills}, title = {Matrix congruences on orthodox semigroups.}, journal = {Semigroup forum}, pages = {87--98}, publisher = {mathdoc}, volume = {31}, year = {1985}, zbl = {0556.20044}, url = {http://geodesic.mathdoc.fr/item/SF_1985__31_134738/} }
J.E. Mills. Matrix congruences on orthodox semigroups.. Semigroup forum, Tome 31 (1985), pp. 87-98. http://geodesic.mathdoc.fr/item/SF_1985__31_134738/