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@article{SF_1976__13_134217, author = {J.A. Brzozowski}, title = {A generalization of finiteness.}, journal = {Semigroup forum}, pages = {239--252}, publisher = {mathdoc}, volume = {13}, year = {1976}, zbl = {0353.20047}, url = {http://geodesic.mathdoc.fr/item/SF_1976__13_134217/} }
J.A. Brzozowski. A generalization of finiteness.. Semigroup forum, Tome 13 (1976), pp. 239-252. http://geodesic.mathdoc.fr/item/SF_1976__13_134217/