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@article{SF_1988__37_1_134911, author = {Peter M. Higgins}, title = {The range order of a product of i transformations from a finite full transformation semigroup.}, journal = {Semigroup forum}, pages = {31--36}, publisher = {mathdoc}, volume = {37}, number = {1}, year = {1988}, zbl = {0636.20041}, url = {http://geodesic.mathdoc.fr/item/SF_1988__37_1_134911/} }
Peter M. Higgins. The range order of a product of i transformations from a finite full transformation semigroup.. Semigroup forum, Tome 37 (1988) no. 1, pp. 31-36. http://geodesic.mathdoc.fr/item/SF_1988__37_1_134911/