@article{02041487,
title = {Avoiding 2-letter signed patterns.},
journal = {S\'eminaire Lotharingien de Combinatoire [electronic only]},
volume = {49},
year = {2002},
zbl = {1031.05003},
language = {en},
url = {http://dml.mathdoc.fr/item/02041487}
}
Mansour, Toufik; West, Julian. Avoiding 2-letter signed patterns.. Séminaire Lotharingien de Combinatoire [electronic only], Tome 49 (2002) . http://gdmltest.u-ga.fr/item/02041487/