@inproceedings{DBLP:conf/ac/Valette86,
  author    = {Robert Valette},
  title     = {Nets in Production Systems},
  booktitle = {Advances in Petri Nets},
  year      = {1986},
  pages     = {191-217},
  ee        = {http://dx.doi.org/10.1007/3-540-17906-2_26},
  crossref  = {DBLP:conf/ac/1986petri2},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/ac/1986petri2,
  editor    = {Wilfried Brauer and
               Wolfgang Reisig and
               Grzegorz Rozenberg},
  title     = {Petri Nets: Central Models and Their Properties, Advances
               in Petri Nets 1986, Part II, Proceedings of an Advanced
               Course, Bad Honnef, 8.-19. September 1986},
  booktitle = {Advances in Petri Nets},
  publisher = {Springer},
  series    = {Lecture Notes in Computer Science},
  volume    = {255},
  year      = {1987},
  isbn      = {3-540-17906-2},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}