@inproceedings{STOC-2008-ChenLL,
	author        = "Jianer Chen and Yang Liu and Songjian Lu and Barry O'Sullivan and Igor Razgon",
	booktitle     = "{Proceedings of the 40th Annual ACM Symposium on Theory of Computing}",
	doi           = "10.1145/1374376.1374404",
	isbn          = "978-1-60558-047-0",
	pages         = "177--186",
	publisher     = "{ACM}",
	title         = "{A fixed-parameter algorithm for the directed feedback vertex set problem}",
	year          = 2008,
}