@inproceedings{ijcai2009p192,
  title     = {Probabilistic Models for Concurrent Chatting Activity Recognition},
  author    = {Lian, Chia-chun and Hsu, Jane Yung-jen},
  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     = {1138--1142},
  year      = {2009},
  url       = {https://ijcai.org/proceedings/2009/192},
}