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@article{SF_1987__36_134892, author = {C.M. Reis}, title = {A note on f-disjunctive languages.}, journal = {Semigroup forum}, pages = {159--166}, publisher = {mathdoc}, volume = {36}, year = {1987}, zbl = {0627.20043}, url = {http://geodesic.mathdoc.fr/item/SF_1987__36_134892/} }
C.M. Reis. A note on f-disjunctive languages.. Semigroup forum, Tome 36 (1987), pp. 159-166. http://geodesic.mathdoc.fr/item/SF_1987__36_134892/