@inproceedings{DBLP:conf/plilp/AptP92,
  author    = {Krzysztof R. Apt and
               Alessandro Pellegrini},
  title     = {Why the Occur-Check is Not a Problem},
  booktitle = {PLILP},
  year      = {1992},
  pages     = {69-86},
  ee        = {http://dx.doi.org/10.1007/3-540-55844-6_87},
  crossref  = {DBLP:conf/plilp/1992},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/plilp/1992,
  editor    = {Maurice Bruynooghe and
               Martin Wirsing},
  title     = {Programming Language Implementation and Logic Programming,
               4th International Symposium, PLILP'92, Leuven, Belgium,
               August 26-28, 1992, Proceedings},
  booktitle = {PLILP},
  publisher = {Springer},
  series    = {Lecture Notes in Computer Science},
  volume    = {631},
  year      = {1992},
  isbn      = {3-540-55844-6},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}