@article{05050781,
title = {Counting rooted trees: the universal law },
journal = {The Electronic Journal of Combinatorics [electronic only]},
volume = {13},
year = {2006},
zbl = {1099.05023},
language = {en},
url = {http://dml.mathdoc.fr/item/05050781}
}
Bell, Jason P.; Burris, Stanley N.; Yeats, Karen A. Counting rooted trees: the universal law . The Electronic Journal of Combinatorics [electronic only], Tome 13 (2006) . http://gdmltest.u-ga.fr/item/05050781/