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@article{SF_1997__54_2_135532, author = {S.A. Annin}, title = {Hierarchy of efficient generators of the symmetric inverse monoid.}, journal = {Semigroup forum}, pages = {327--355}, publisher = {mathdoc}, volume = {54}, number = {2}, year = {1997}, zbl = {0873.20043}, url = {http://geodesic.mathdoc.fr/item/SF_1997__54_2_135532/} }
S.A. Annin. Hierarchy of efficient generators of the symmetric inverse monoid.. Semigroup forum, Tome 54 (1997) no. 2, pp. 327-355. http://geodesic.mathdoc.fr/item/SF_1997__54_2_135532/