@article{ DBLP:journals/dm/Olariu92,
  author    = {Stephan Olariu},
  title     = {On sources in comparability graphs, with applications},
  journal   = {Discrete Mathematics},
  pages   = {289-292},
  volume   = {110},
  number   = {1-3},
  ee   = {http://dx.doi.org/10.1016/0012-365X(92)90721-Q} ,
  year   = {1992}
}

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