@inproceedings{LICS-2015-CarvalhoMM,
	author        = "Catarina Carvalho and Florent R. Madelaine and Barnaby Martin",
	booktitle     = "{Proceedings of the 30th Annual ACM/IEEE Symposium on Logic in Computer Science}",
	doi           = "10.1109/LICS.2015.50",
	isbn          = "978-1-4799-8875-4",
	pages         = "462--474",
	publisher     = "{IEEE}",
	title         = "{From Complexity to Algebra and Back: Digraph Classes, Collapsibility, and the PGP}",
	year          = 2015,
}