@inproceedings{DBLP:conf/hybrid/EngelKMPRS92,
  author    = {Marcin Engel and Marcin Kubica and Jan Madey and David Lorge Parnas and Anders P. Ravn and A. John van Schouwen},
  title     = {A Formal Approach to Computer Systems Requirements Documentation.},
  booktitle = {Hybrid Systems},
  year      = {1992},
  pages     = {452-474},
  crossref  = {DBLP:conf/hybrid/1992},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/hybrid/1992,
  editor    = {Robert L. Grossman and Anil Nerode and Anders P. Ravn and Hans Rischel},
  title     = {Hybrid Systems},
  booktitle = {Hybrid Systems},
  publisher = {Springer},
  series    = {Lecture Notes in Computer Science},
  volume    = {736},
  year      = {1993},
  isbn      = {3-540-57318-6},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}