@article{02186866,
title = {A combinatorial derivation of the number of labeled forests.},
journal = {Journal of Integer Sequences [electronic only]},
volume = {6},
year = {2003},
zbl = {1064.05083},
language = {en},
url = {http://dml.mathdoc.fr/item/02186866}
}
Callan, David. A combinatorial derivation of the number of labeled forests.. Journal of Integer Sequences [electronic only], Tome 6 (2003) . http://gdmltest.u-ga.fr/item/02186866/