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@article{SF_1980__19_134383, author = {R.M. Capocelli}, title = {On optimal factorization of free semigroups into free subsemigroups.}, journal = {Semigroup forum}, pages = {199--212}, publisher = {mathdoc}, volume = {19}, year = {1980}, zbl = {0428.20031}, url = {http://geodesic.mathdoc.fr/item/SF_1980__19_134383/} }
R.M. Capocelli. On optimal factorization of free semigroups into free subsemigroups.. Semigroup forum, Tome 19 (1980), pp. 199-212. http://geodesic.mathdoc.fr/item/SF_1980__19_134383/