@inproceedings{ijcai2013p278,
  title     = {Bilevel Visual Words Coding for Image Classification},
  author    = {Zhang, Jiemi and Wu, Chenxia and Cai, Deng and Zhu, Jianke},
  booktitle = {Proceedings of the Twenty-Third International Joint Conference on
               Artificial Intelligence, {IJCAI-13}},
  publisher = {AAAI Press / International Joint Conferences on Artificial Intelligence},
  editor    = {Francesca Rossi},
  pages     = {1883--1887},
  year      = {2013},
  month     = {8},
  url       = {https://ijcai.org/proceedings/2013/278},
}