@article{01373519,
title = {Contravariant functors on finite sets and Stirling numbers.},
journal = {Theory and Applications of Categories [electronic only]},
volume = {6},
year = {1999},
pages = {65-76},
zbl = {0967.18001},
language = {en},
url = {http://dml.mathdoc.fr/item/01373519}
}
Paré, Robert. Contravariant functors on finite sets and Stirling numbers.. Theory and Applications of Categories [electronic only], Tome 6 (1999) pp. 65-76. http://gdmltest.u-ga.fr/item/01373519/