@article{02248134,
title = {An introduction to },
journal = {The Electronic Journal of Combinatorics [electronic only]},
volume = {12},
year = {2005},
zbl = {1090.05002},
language = {en},
url = {http://dml.mathdoc.fr/item/02248134}
}
Morrison, Kent E. An introduction to . The Electronic Journal of Combinatorics [electronic only], Tome 12 (2005) . http://gdmltest.u-ga.fr/item/02248134/