@article{02161275,
title = {Enumerative formulae for unrooted planar maps: a pattern.},
journal = {The Electronic Journal of Combinatorics [electronic only]},
volume = {11},
year = {2004},
zbl = {1060.05046},
language = {en},
url = {http://dml.mathdoc.fr/item/02161275}
}
Liskovets, Valery A. Enumerative formulae for unrooted planar maps: a pattern.. The Electronic Journal of Combinatorics [electronic only], Tome 11 (2004) . http://gdmltest.u-ga.fr/item/02161275/