@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/