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@article{SF_1984__29_134699, author = {W. Forys}, title = {A fixed point characterization of cofinite languages.}, journal = {Semigroup forum}, pages = {378--380}, publisher = {mathdoc}, volume = {29}, year = {1984}, zbl = {0549.20052}, url = {http://geodesic.mathdoc.fr/item/SF_1984__29_134699/} }
W. Forys. A fixed point characterization of cofinite languages.. Semigroup forum, Tome 29 (1984), pp. 378-380. http://geodesic.mathdoc.fr/item/SF_1984__29_134699/