@inproceedings{DBLP:conf/zum/Harrison91,
  author    = {Michael Harrison},
  title     = {Engineering Human-Error Tolerant Software},
  booktitle = {Z User Workshop},
  year      = {1991},
  pages     = {191-204},
  crossref  = {DBLP:conf/zum/1991},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/zum/1991,
  editor    = {J. E. Nicholls},
  title     = {Z User Workshop, York, UK, 16-17 December 1991, Proceedings},
  booktitle = {Z User Workshop},
  publisher = {Springer},
  series    = {Workshops in Computing},
  year      = {1992},
  isbn      = {3-540-19780-X},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}