@INPROCEEDINGS{dmp07,
  author = {U. {Dal Lago} and A. Montanari and G. Puppis},
  title = {On the Equivalence of Automaton-Based Representations of Time Granularities},
  booktitle = {Proceedings of the 14th International Symposium on Temporal Representation and Reasoning (TIME)},
  year = {2007},
  pages = {82-93},
  publisher = {IEEE Computer Society}
}