@inproceedings{PODS-2014-GrecoS,
	author        = "Gianluigi Greco and Francesco Scarcello",
	booktitle     = "{Proceedings of the 33rd Symposium on Principles of Database Systems}",
	doi           = "10.1145/2594538.2594559",
	isbn          = "978-1-4503-2375-8",
	pages         = "132--143",
	publisher     = "{ACM}",
	title         = "{Counting solutions to conjunctive queries: structural and hybrid tractability}",
	year          = 2014,
}