@article{qu2015subspace,
  title={Subspace Vertex Pursuit: A Fast and Robust Near-Separable Nonnegative Matrix Factorization Method for Hyperspectral Unmixing},
  author={Qu, Qing and Nasrabadi, Nasser M and Tran, Trac D},
  journal={IEEE Journal of Selected Topics in Signal Processing}, 
  year={2015},
  volume={9},
  number={6},
  pages={1142-1155},
}