BreuK98'

@article{DBLP:journals/comgeo/BreuK98,
  author    = {Heinz Breu and
               David G. Kirkpatrick},
  title     = {Unit disk graph recognition is NP-hard},
  journal   = {Comput. Geom.},
  volume    = {9},
  number    = {1-2},
  year      = {1998},
  pages     = {3-24},
  ee        = {http://dx.doi.org/10.1016/S0925-7721(97)00014-X},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}