@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},
	biburl = {http://www.bibsonomy.org/bibtex/2cbee96d7e7d85646e1ad99fed7a23d8b/dblp},
	description = {dblp},
	ee = {http://dx.doi.org/10.1016/0012-365X(92)90622-M}, date = {2007-07-04},
	keywords = {dblp }
}