@article{01247860,
title = {On the theory of Pfaffian orientations. I: Perfect matchings and permanents.},
journal = {The Electronic Journal of Combinatorics [electronic only]},
volume = {6},
year = {1999},
zbl = {0909.05005},
language = {en},
url = {http://dml.mathdoc.fr/item/01247860}
}
Gallucio, Anna; Loebl, Martin. On the theory of Pfaffian orientations. I: Perfect matchings and permanents.. The Electronic Journal of Combinatorics [electronic only], Tome 6 (1999) . http://gdmltest.u-ga.fr/item/01247860/