@article{shi2005blind,
  title={Blind source separation of more sources than mixtures using sparse mixture models},
  author={Shi, Zhenwei and Tang, Huanwen and Tang, Yiyuan},
  journal={Pattern Recognition Letters},
  volume={26},
  number={16},
  pages={2491--2499},
  year={2005},
  publisher={Elsevier}
}