Feedback Vertex Sets in Tournaments. Gaspers, S. & Mnich, M. Journal of Graph Theory, 72(1):72--89, 2013.
Feedback Vertex Sets in Tournaments [link]Paper  doi  bibtex   
@article{DBLP:journals/jgt/GaspersM13,
  author    = {Serge Gaspers and
               Matthias Mnich},
  title     = {Feedback Vertex Sets in Tournaments},
  journal   = {Journal of Graph Theory},
  volume    = {72},
  number    = {1},
  pages     = {72--89},
  year      = {2013},
  url       = {http://dx.doi.org/10.1002/jgt.21631},
  doi       = {10.1002/jgt.21631},
  timestamp = {Thu, 22 Nov 2012 00:00:00 +0100},
  biburl    = {http://dblp.dagstuhl.de/rec/bib/journals/jgt/GaspersM13},
  bibsource = {dblp computer science bibliography, http://dblp.org}
}

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