GradelOR99'

BibTeX

@article{DBLP:journals/aml/GradelOR99,
  author    = {Erich Gr{\"a}del and
               Martin Otto and
               Eric Rosen},
  title     = {Undecidability results on two-variable logics},
  journal   = {Arch. Math. Log.},
  volume    = {38},
  number    = {4-5},
  year      = {1999},
  pages     = {313-354},
  ee        = {http://dx.doi.org/10.1007/s001530050130},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}