@InProceedings{zhang:iccv03,
  author =	 {T.\ Zhang and D.\ Freedman},
  title =	 {Tracking objects using density matching and shape
                  priors},
  booktitle =	 {Proceedings of the IEEE International Conference on
                  Computer Vision},
  volume =	 2,
  pages =	 {1056-1062}
}