Cascaded regression with sparsified feature covariance matrix for facial landmark detection. Sánchez-Lozano, E., Martinez, B., & Valstar, M. F Pattern Recognition Letters, 73:19–25, North-Holland, 2016.
bibtex   
@article{sanchez2016cascaded,
  title={Cascaded regression with sparsified feature covariance matrix for facial landmark detection},
  author={S{\'a}nchez-Lozano, Enrique and Martinez, Brais and Valstar, Michel F},
  journal={Pattern Recognition Letters},
  volume={73},
  pages={19--25},
  year={2016},
  publisher={North-Holland}
}

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