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@article{SF_1980__19_134370, author = {F.W. Roush and K.H. Kim}, title = {The average rank of a product of transformations.}, journal = {Semigroup forum}, pages = {79--86}, publisher = {mathdoc}, volume = {19}, year = {1980}, zbl = {0429.20057}, url = {http://geodesic.mathdoc.fr/item/SF_1980__19_134370/} }
F.W. Roush; K.H. Kim. The average rank of a product of transformations.. Semigroup forum, Tome 19 (1980), pp. 79-86. http://geodesic.mathdoc.fr/item/SF_1980__19_134370/