@INPROCEEDINGS {
	AUTHOR = "Pablo Barcel{\'o}",
	TITLE = "Semantic Acyclicity for Conjunctive Queries: Approximations and Constraints",
	BOOKTITLE = "23rd Workshop on Logic, Language, Information, and Computation (WOLLIC)",
	PAGES = "104-108",
	YEAR = "2016",
	PUBLISHER = "Springer",
	SERIES ="Lecture Notes in Computer Science",
	}