Contracting Graphs to Paths and Trees. Heggernes, P., van 't Hof, P., Lévêque, B., Lokshtanov, D., & Paul, C. Algorithmica, 68(1):109-132, 2014.
Contracting Graphs to Paths and Trees [link]Paper  bibtex   
@article{ dblp1938499,
  title = {Contracting Graphs to Paths and Trees},
  author = {Pinar Heggernes and Pim van 't Hof and Benjamin Lévêque and Daniel Lokshtanov and Christophe Paul},
  author_short = {Heggernes, P. and van 't Hof, P. and Lévêque, B. and Lokshtanov, D. and Paul, C.},
  bibtype = {article},
  type = {article},
  year = {2014},
  key = {dblp1938499},
  id = {dblp1938499},
  biburl = {http://www.dblp.org/rec/bibtex/journals/algorithmica/HeggernesHLLP14},
  url = {http://dx.doi.org/10.1007/s00453-012-9670-2},
  journal = {Algorithmica},
  pages = {109-132},
  number = {1},
  volume = {68},
  text = {Algorithmica 68(1):109-132 (2014)}
}

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