@article{01258349,
title = {Enumeration of tilings of diamonds and hexagons with defects.},
journal = {The Electronic Journal of Combinatorics [electronic only]},
volume = {6},
year = {1999},
zbl = {0916.05018},
language = {en},
url = {http://dml.mathdoc.fr/item/01258349}
}
Helfgott, Harald A.; Gessel, Ira M. Enumeration of tilings of diamonds and hexagons with defects.. The Electronic Journal of Combinatorics [electronic only], Tome 6 (1999) . http://gdmltest.u-ga.fr/item/01258349/