A fixed-parameter algorithm for the directed feedback vertex set problem.

Jianer Chen Yang Liu 0002 Songjian Lu Barry O'Sullivan Igor Razgon A fixed-parameter algorithm for the directed feedback vertex set problem. 2008 55 J. ACM 5 http://doi.acm.org/10.1145/1411509.1411511 db/journals/jacm/jacm55.html#ChenLLOR08