@INPROCEEDINGS{bmp04,
  author = {D. Bresolin and A. Montanari and G. Puppis},
  title = {Time Granularities and Ultimately Periodic Automata},
  booktitle = {Proceedings of the 9th European Conference on Logics in Artificial Intelligence (JELIA)},
  year = {2004},
  volume = {3229},
  series = {LNCS},
  pages = {513-525},
  publisher = {Springer}
}