@article{Zhang2012A,
  title={A two-dimensional Neighborhood Preserving Projection for appearance-based face recognition},
  author={Zhang, Haijun and Wu, Q. M. Jonathan and Chow, Tommy W. S. and Zhao, Mingbo},
  journal={Pattern Recognition},
  volume={45},
  number={5},
  pages={1866-1876},
  year={2012},
}