E
[EN94] Javier Esparza and Mogens Nielsen. Decidability Issues for Petri Nets – A survey. EATCS Bulletin 52:244-262. EATCS, February 1994. 
@article{EN94,
  author =              {Esparza, Javier and Nielsen, Mogens},
  title =               {Decidability Issues for {P}etri Nets~-- A~survey},
  publisher =           {EATCS},
  journal =             {EATCS Bulletin},
  volume =              {52},
  pages =               {244-262},
  year =                {1994},
  month =               feb,
}
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