@article{DBLP:journals/bsl/GradelKV97,
  author    = {Erich Gr{\"a}del and
               Phokion G. Kolaitis and
               Moshe Y. Vardi},
  title     = {On the decision problem for two-variable first-order logic},
  journal   = {Bulletin of Symbolic Logic},
  volume    = {3},
  number    = {1},
  year      = {1997},
  pages     = {53-69},
  ee        = {http://www.math.ucla.edu/$\sim$asl/bsl/0301/0301-003.ps},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}