GaifmanV85'

BibTeX

@article{DBLP:journals/eatcs/GaifmanV85,
  author    = {Haim Gaifman and
               Moshe Y. Vardi},
  title     = {A simple proof that connectivity of finite graphs is not
               first-order definable},
  journal   = {Bulletin of the EATCS},
  volume    = {26},
  year      = {1985},
  pages     = {43-44},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}