E
[Esp98] Javier Esparza. Decidability and Complexity of Petri Net Problems: An Introduction. In Lectures on Petri Nets I: Basic Models, Advances in Petri Nets, Lecture Notes in Computer Science 1491, pages 374-428. Springer-Verlag, 1998. 
@inproceedings{acpn1-Esp,
  author =              {Esparza, Javier},
  title =               {Decidability and Complexity of {P}etri Net Problems:
                         An Introduction},
  editor =              {Reisig, Wolfgang and Rozenberg, Grzegorz},
  booktitle =           {Lectures on {P}etri Nets~{I}: Basic Models, Advances
                         in {P}etri Nets},
  publisher =           {Springer-Verlag},
  series =              {Lecture Notes in Computer Science},
  volume =              {1491},
  pages =               {374-428},
  year =                {1998},
  confyear =            {1996},
  confmonth =           {9},
}
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