@article{1183529387, author = {Mallows, C. L. and Riordan, John}, title = {The inversion enumerator for labeled trees}, journal = {Bull. Amer. Math. Soc.}, volume = {74}, number = {6}, year = {1968}, pages = { 92-94}, language = {en}, url = {http://dml.mathdoc.fr/item/1183529387} }
Mallows, C. L.; Riordan, John. The inversion enumerator for labeled trees. Bull. Amer. Math. Soc., Tome 74 (1968) no. 6, pp. 92-94. http://gdmltest.u-ga.fr/item/1183529387/