@InProceedings{matsuzaki-EtAl:2013:IJCNLP,
  author    = {Matsuzaki, Takuya  and  Iwane, Hidenao  and  Anai, Hirokazu  and  Arai, Noriko},
  title     = {The Complexity of Math Problems -- Linguistic, or Computational?},
  booktitle = {Proceedings of the Sixth International Joint Conference on Natural Language Processing},
  month     = {October},
  year      = {2013},
  address   = {Nagoya, Japan},
  publisher = {Asian Federation of Natural Language Processing},
  pages     = {73--81},
  url       = {http://www.aclweb.org/anthology/I13-1009}
}