@article{05050755,
title = {A Gessel--Viennot-type method for cycle systems in a directed graph.},
journal = {The Electronic Journal of Combinatorics [electronic only]},
volume = {13},
year = {2006},
zbl = {1100.05050},
language = {en},
url = {http://dml.mathdoc.fr/item/05050755}
}
Hanusa, Christopher R.H. A Gessel--Viennot-type method for cycle systems in a directed graph.. The Electronic Journal of Combinatorics [electronic only], Tome 13 (2006) . http://gdmltest.u-ga.fr/item/05050755/