@article{03788628, title = {Equivalence classes of functions on finite sets.}, journal = {International Journal of Mathematics and Mathematical Sciences}, volume = {5}, year = {1982}, pages = {745-762}, doi = {10.1155/S0161171282000696}, zbl = {0501.05006}, language = {en}, url = {http://dml.mathdoc.fr/item/03788628} }
Chao, Chong-Yun; Deisher, Caroline I. Equivalence classes of functions on finite sets.. International Journal of Mathematics and Mathematical Sciences, Tome 5 (1982) pp. 745-762. doi : 10.1155/S0161171282000696. http://gdmltest.u-ga.fr/item/03788628/