@article{05540969,
title = {A cluster expansion formula (},
journal = {The Electronic Journal of Combinatorics [electronic only]},
volume = {15},
year = {2008},
zbl = {1184.13064},
language = {en},
url = {http://dml.mathdoc.fr/item/05540969}
}
Schiffler, Ralf. A cluster expansion formula (. The Electronic Journal of Combinatorics [electronic only], Tome 15 (2008) . http://gdmltest.u-ga.fr/item/05540969/