@article{DBLP:journals/ai/JonssonK04,
  author    = {Peter Jonsson and
               Andrei A. Krokhin},
  title     = {Complexity classification in qualitative temporal constraint
               reasoning},
  journal   = {Artif. Intell.},
  volume    = {160},
  number    = {1-2},
  year      = {2004},
  pages     = {35-51},
  ee        = {http://dx.doi.org/10.1016/j.artint.2004.05.010},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}