@inproceedings{DBLP:conf/tapsoft/Schwartzbach91,
  author    = {Michael I. Schwartzbach},
  title     = {Type Inference with Inequalities},
  booktitle = {TAPSOFT, Vol.1},
  year      = {1991},
  pages     = {441-455},
  ee        = {http://dx.doi.org/10.1007/3-540-53982-4_24},
  crossref  = {DBLP:conf/tapsoft/1991-1},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/tapsoft/1991-1,
  editor    = {Samson Abramsky and
               T. S. E. Maibaum},
  title     = {TAPSOFT'91: Proceedings of the International Joint Conference
               on Theory and Practice of Software Development, Brighton,
               UK, April 8-12, 1991, Volume 1: Colloquium on Trees in Algebra
               and Programming (CAAP'91)},
  booktitle = {TAPSOFT, Vol.1},
  publisher = {Springer},
  series    = {Lecture Notes in Computer Science},
  volume    = {493},
  year      = {1991},
  isbn      = {3-540-53982-4},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}