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@article{SF_1979__17_134325, author = {Stefan Schwarz}, title = {A theorem on binary relations and infinite languages.}, journal = {Semigroup forum}, pages = {307--316}, publisher = {mathdoc}, volume = {17}, year = {1979}, zbl = {0425.20053}, url = {http://geodesic.mathdoc.fr/item/SF_1979__17_134325/} }
Stefan Schwarz. A theorem on binary relations and infinite languages.. Semigroup forum, Tome 17 (1979), pp. 307-316. http://geodesic.mathdoc.fr/item/SF_1979__17_134325/