Hierarchical filtering scheme for the detection of facial keypoints
@InProceedings{michaelis97icassp,
  author =       {M. Michaelis and R. Herpers and L. Witta and G. Sommer},
  title = 	 {Hierarchical filtering scheme for the detection of facial keypoints},
  year = 	 {1997},
  publisher = {IEEE Computer Society Press},
  booktitle = {Proc. of the Int. Conf. on Acoustics, Speech and Signal Processing, ICASSPŽ97, M{"u}nchen,},
  pages =        {2541--2544}
}