@article{DBLP:journals/ipl/AppaMM05,
  author    = {Gautam Appa and
               Dimitris Magos and
               Ioannis Mourtos},
  title     = {On the system of two {\it all_different} predicates},
  journal   = {Inf. Process. Lett.},
  volume    = {94},
  number    = {3},
  year      = {2005},
  pages     = {99-105},
  ee        = {http://dx.doi.org/10.1016/j.ipl.2005.01.009},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}