Coloring a graph optimally with two colors. Broersma, H. J. & Göbel, F. Discrete Mathematics (DM), 118(1-3):23-31, 1993.
Coloring a graph optimally with two colors [link]Paper  bibtex   
@article{ dblp3511129,
  title = {Coloring a graph optimally with two colors},
  author = {H. J. Broersma and F. Göbel},
  author_short = {Broersma, H. J. and Göbel, F.},
  bibtype = {article},
  type = {article},
  year = {1993},
  key = {dblp3511129},
  id = {dblp3511129},
  biburl = {http://www.dblp.org/rec/bibtex/journals/dm/BroersmaG93},
  url = {http://dx.doi.org/10.1016/0012-365X(93)90050-4},
  journal = {Discrete Mathematics (DM)},
  pages = {23-31},
  number = {1-3},
  volume = {118},
  text = {Discrete Mathematics (DM) 118(1-3):23-31 (1993)}
}

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