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@article{SF_1984__30_134720, author = {H.J. Shyr}, title = {A characterization of dense languages.}, journal = {Semigroup forum}, pages = {237--240}, publisher = {mathdoc}, volume = {30}, year = {1984}, zbl = {0548.20050}, url = {http://geodesic.mathdoc.fr/item/SF_1984__30_134720/} }
H.J. Shyr. A characterization of dense languages.. Semigroup forum, Tome 30 (1984), pp. 237-240. http://geodesic.mathdoc.fr/item/SF_1984__30_134720/