@InProceedings{FGRV04,
  author =       {Finkel, A. and Geeraerts, G. and Raskin, J.-F. and {Van~Begin}, L.},
  title =        {On the omega-language expressive power of extended {P}etri nets},
  booktitle =    {Proceedings of EXPRESS'04, 11th International Workshop on Expressiveness in Concurrency, London, Great Britain},
  year =         {2004}, 
  volume =       {128},
  number =       {2},
  series =       {Electronic Notes in Theoretical Computer Science},
  publisher =    {Elsevier Publishing},
  pages =        {87--101},
  url =          {http://www.ulb.ac.be/di/ssd/ggeeraer/papers/express.pdf},

}