@article{GDZPPN001253662,
title = {The average rank of a product of transformations.},
journal = {Semigroup forum},
volume = {20},
year = {1980},
pages = {79-86},
zbl = {0429.20057},
url = {http://dml.mathdoc.fr/item/GDZPPN001253662}
}
Roush, F.W.; Kim, K.H. The average rank of a product of transformations.. Semigroup forum, Tome 20 (1980) pp. 79-86. http://gdmltest.u-ga.fr/item/GDZPPN001253662/