@inproceedings{ijcai2009p239,
  title     = {Topic Tracking Model for Analyzing Consumer Purchase Behavior},
  author    = {Iwata, Tomoharu and Watanabe, Shinji and Yamada, Takeshi and Ueda, Naonori},
  booktitle = {Proceedings of the Twenty-First International Joint Conference on
               Artificial Intelligence, {IJCAI-09}},
  publisher = {International Joint Conferences on Artificial Intelligence},
  editor    = {Hiroaki Kitano},
  pages     = {1427--1431},
  year      = {2009},
  url       = {https://ijcai.org/proceedings/2009/239},
}