@InProceedings{otsuka-EtAl:2013:SIGDIAL,
  author    = {Otsuka, Tsugumi  and  Komatani, Kazunori  and  Sato, Satoshi  and  Nakano, Mikio},
  title     = {Generating More Specific Questions for Acquiring Attributes of Unknown Concepts from Users},
  booktitle = {Proceedings of the SIGDIAL 2013 Conference},
  month     = {August},
  year      = {2013},
  address   = {Metz, France},
  publisher = {Association for Computational Linguistics},
  pages     = {70--77},
  url       = {http://www.aclweb.org/anthology/W13-4009}
}