@InProceedings{niemi-koskenniemi:2007:NODALIDA,
  author    = {Niemi, Jyrki  and  Koskenniemi, Kimmo},
  title     = {Representing Calendar Expressions with Finite-State Transducers that Bracket Periods of Time on a Hierachical Timeline},
  booktitle = {Proceedings of the 16th Nordic Conference of Computational Linguistics (NODALIDA 2007)},
  month     = {May},
  year      = {2007},
  address   = {Tartu, Estonia},
  publisher = {University of Tartu, Estonia},
  pages     = {355--362},
  url       = {http://www.aclweb.org/anthology/W07-2457}
}