Is Your Model Checker on Time? On the Complexity of Model Checking for Timed Modal Logics. Aceto, L. & Laroussinie, F. In Mathematical Foundations of Computer Science 1999, 24th International Symposium, MFCS'99, Szklarska Poreba, Poland, September 6-10, 1999, Proceedings, pages 125–136, 1999.
Is Your Model Checker on Time? On the Complexity of Model Checking for Timed Modal Logics [link]Paper  doi  bibtex   
@inproceedings{DBLP:conf/mfcs/AcetoL99,
  author    = {Luca Aceto and
               Fran{\c{c}}ois Laroussinie},
  title     = {Is Your Model Checker on Time? On the Complexity of Model Checking
               for Timed Modal Logics},
  booktitle = {Mathematical Foundations of Computer Science 1999, 24th International
               Symposium, MFCS'99, Szklarska Poreba, Poland, September 6-10, 1999,
               Proceedings},
  pages     = {125--136},
  year      = {1999},
  crossref  = {DBLP:conf/mfcs/1999},
  url       = {https://doi.org/10.1007/3-540-48340-3\_12},
  doi       = {10.1007/3-540-48340-3\_12},
  timestamp = {Wed, 24 May 2017 15:40:45 +0200},
  biburl    = {https://dblp.org/rec/bib/conf/mfcs/AcetoL99},
  bibsource = {dblp computer science bibliography, https://dblp.org}
}

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