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@article{SF_1992__44_1_135139, author = {S. Margolis and C.J. Meakin}, title = {Inverse monoids and rational {Schreier} subsets of the free group.}, journal = {Semigroup forum}, pages = {137--148}, publisher = {mathdoc}, volume = {44}, number = {1}, year = {1992}, zbl = {0757.20017}, url = {http://geodesic.mathdoc.fr/item/SF_1992__44_1_135139/} }
S. Margolis; C.J. Meakin. Inverse monoids and rational Schreier subsets of the free group.. Semigroup forum, Tome 44 (1992) no. 1, pp. 137-148. http://geodesic.mathdoc.fr/item/SF_1992__44_1_135139/