@inproceedings{DBLP:conf/apn/CouvreurHP91,
  author    = {Jean-Michel Couvreur and
               Serge Haddad and
               J. F. Peyre},
  title     = {Generative Families of Positive Invariants in Coloured Nets
               Sub-Classes},
  booktitle = {Applications and Theory of Petri Nets},
  year      = {1991},
  pages     = {51-70},
  ee        = {http://dx.doi.org/10.1007/3-540-56689-9_39},
  crossref  = {DBLP:conf/apn/1991},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}

@proceedings{DBLP:conf/apn/1991,
  editor    = {Grzegorz Rozenberg},
  title     = {Advances in Petri Nets 1993, Papers from the 12th International
               Conference on Applications and Theory of Petri Nets, Gjern,
               Denmark, June 1991},
  booktitle = {Applications and Theory of Petri Nets},
  publisher = {Springer},
  series    = {Lecture Notes in Computer Science},
  volume    = {674},
  year      = {1993},
  isbn      = {3-540-56689-9},
  bibsource = {DBLP, http://dblp.uni-trier.de}
}