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@article{SF_1975__11_186352, author = {H.J. SHYR}, title = {Some {Free} {Submonoids} of the {Free} {Monoid} of {Prefix} {Codes.}}, journal = {Semigroup forum}, pages = {22--29}, publisher = {mathdoc}, volume = {11}, year = {1975}, zbl = {0299.94005}, url = {http://geodesic.mathdoc.fr/item/SF_1975__11_186352/} }
H.J. SHYR. Some Free Submonoids of the Free Monoid of Prefix Codes.. Semigroup forum, Tome 11 (1975), pp. 22-29. http://geodesic.mathdoc.fr/item/SF_1975__11_186352/