Locality of order-invariant first-order formulas. Grohe, M. & Schwentick, T. ACM Trans. Comput. Log., 1(1):112–130, 2000.
Locality of order-invariant first-order formulas [link]Paper  doi  bibtex   
@article{DBLP:journals/tocl/GroheS00,
  author    = {Martin Grohe and
               Thomas Schwentick},
  title     = {Locality of order-invariant first-order formulas},
  journal   = {{ACM} Trans. Comput. Log.},
  volume    = {1},
  number    = {1},
  pages     = {112--130},
  year      = {2000},
  url       = {https://doi.org/10.1145/343369.343386},
  doi       = {10.1145/343369.343386},
  timestamp = {Tue, 06 Nov 2018 00:00:00 +0100},
  biburl    = {https://dblp.org/rec/journals/tocl/GroheS00.bib},
  bibsource = {dblp computer science bibliography, https://dblp.org}
}

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