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@article{SF_1984__29_134681, author = {J. Karhum\"aki}, title = {A note on intersections of free submonoids of a free monoid.}, journal = {Semigroup forum}, pages = {183--206}, publisher = {mathdoc}, volume = {29}, year = {1984}, zbl = {0555.20037}, url = {http://geodesic.mathdoc.fr/item/SF_1984__29_134681/} }
J. Karhumäki. A note on intersections of free submonoids of a free monoid.. Semigroup forum, Tome 29 (1984), pp. 183-206. http://geodesic.mathdoc.fr/item/SF_1984__29_134681/