@ARTICLE{6675070,
  author={Tang, Wei and Shi, Zhenwei and Wu, Ying},
  journal={IEEE Transactions on Geoscience and Remote Sensing}, 
  title={Regularized Simultaneous Forward–Backward Greedy Algorithm for Sparse Unmixing of Hyperspectral Data}, 
  year={2014},
  volume={52},
  number={9},
  pages={5271-5288},
  doi={10.1109/TGRS.2013.2287795}}