@Inproceedings{EPTCS8.4,
  author    = {Gazda, Maciej and Fokkink, Wan},
  year      = {2009},
  title     = {Modal Logic and the Approximation Induction Principle},
  editor    = {Fr\"oschle, Sibylle and Gorla, Daniele},
  booktitle = {{\rm Proceedings 16th International Workshop on}
               Expressiveness in Concurrency,
               {\rm Bologna, Italy, 5th September 2009}},
  series    = {Electronic Proceedings in Theoretical Computer Science},
  volume    = {8},
  publisher = {Open Publishing Association},
  pages     = {41-50},
  doi       = {10.4204/EPTCS.8.4},
}