@inproceedings{DBLP:conf/lics/Robinson89,
  author    = {Edmund Robinson},
  title     = {How Complete is PER?},
  booktitle = {LICS},
  year      = {1989},
  pages     = {106-111},
  ee        = {http://dx.doi.org/10.1109/LICS.1989.39165},
  crossref  = {DBLP:conf/lics/LICS4, DBLP:conf/lics/1989},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/lics/1989,
  title     = {Proceedings of the Fourth Annual Symposium on Logic in Computer
               Science (LICS '89), Pacific Grove, California, USA, June
               5-8, 1989},
  booktitle = {LICS},
  publisher = {IEEE Computer Society},
  year      = {1989},
  isbn      = {0-8186-1954-6},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}