LedleyW76'

@article{DBLP:journals/cl/LedleyW76,
  author    = {Robert S. Ledley and
               James B. Wilson},
  title     = {The Precise Handling of Qualitative Relationships},
  journal   = {Comput. Lang.},
  volume    = {1},
  number    = {1},
  year      = {1976},
  pages     = {83-99},
  ee        = {http://dx.doi.org/10.1016/0096-0551(75)90010-7},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}