@inproceedings{DBLP:conf/ibpria/JustoT09,
  author    = {Raquel Justo and
               M. In{\'{e}}s Torres},
  title     = {An Approach to Estimate Perplexity Values for Language Models Based
               on Phrase Classes},
  booktitle = {Pattern Recognition and Image Analysis, 4th Iberian Conference, IbPRIA
               2009, P{\'{o}}voa de Varzim, Portugal, June 10-12, 2009, Proceedings},
  year      = {2009},
  pages     = {409--416},
  crossref  = {DBLP:conf/ibpria/2009},
  url       = {http://dx.doi.org/10.1007/978-3-642-02172-5_53},
  doi       = {10.1007/978-3-642-02172-5_53},
  timestamp = {Fri, 03 Oct 2014 12:23:15 +0200},
  biburl    = {http://dblp.uni-trier.de/rec/bib/conf/ibpria/JustoT09},
  bibsource = {dblp computer science bibliography, http://dblp.org}
}

@proceedings{DBLP:conf/ibpria/2009,
  editor    = {Helder Ara{\'{u}}jo and
               Ana Maria Mendon{\c{c}}a and
               Armando J. Pinho and
               M. In{\'{e}}s Torres},
  title     = {Pattern Recognition and Image Analysis, 4th Iberian Conference, IbPRIA
               2009, P{\'{o}}voa de Varzim, Portugal, June 10-12, 2009, Proceedings},
  series    = {Lecture Notes in Computer Science},
  year      = {2009},
  volume    = {5524},
  publisher = {Springer},
  url       = {http://dx.doi.org/10.1007/978-3-642-02172-5},
  doi       = {10.1007/978-3-642-02172-5},
  isbn      = {978-3-642-02171-8},
  timestamp = {Fri, 03 Oct 2014 12:23:15 +0200},
  biburl    = {http://dblp.uni-trier.de/rec/bib/conf/ibpria/2009},
  bibsource = {dblp computer science bibliography, http://dblp.org}
}