@article{02161283, title = {Packing densities of patterns.}, journal = {The Electronic Journal of Combinatorics [electronic only]}, volume = {11}, year = {2004}, zbl = {1061.05007}, language = {en}, url = {http://dml.mathdoc.fr/item/02161283} }
Barton, Reid W. Packing densities of patterns.. The Electronic Journal of Combinatorics [electronic only], Tome 11 (2004) . http://gdmltest.u-ga.fr/item/02161283/