@article{wang2017context,
  author={Wang, Lei and Zhao, Xu and Si, Yunfei and Cao, Liangliang and Liu, Yuncai},
  journal={IEEE Transactions on Multimedia}, 
  title={Context-Associative Hierarchical Memory Model for Human Activity Recognition and Prediction}, 
  year={2017},
  volume={19},
  number={3},
  pages={646-659},
}