@article{journals/dm/ChenR92,
title = {q-Analogs of the inclusion- exclusion principle and permutations with restricted position.},
author = {William Y. C. Chen and Gian-Carlo Rota},
journal = {Discrete Mathematics},
number = {1},
pages = {7-22},
url = {http://dblp.uni-trier.de/db/journals/dm/dm104.html#ChenR92},
volume = {104},
year = {1992},
description = {dblp},
ee = {http://dx.doi.org/10.1016/0012-365X(92)90622-M}, date = {2007-07-04},
keywords = {dblp }
}
::