@article{02171963,
title = {Irreducible compositions and the first return to the origin of a random walk.},
journal = {S\'eminaire Lotharingien de Combinatoire [electronic only]},
volume = {50},
year = {2003},
zbl = {1064.60014},
language = {en},
url = {http://dml.mathdoc.fr/item/02171963}
}
Bender, Edward A.; Lawler, Gregory F.; Pemantle, Robin; Wilf, Herbert S. Irreducible compositions and the first return to the origin of a random walk.. Séminaire Lotharingien de Combinatoire [electronic only], Tome 50 (2003) . http://gdmltest.u-ga.fr/item/02171963/