Matching gradient descriptors with topological constraints to characterise the crowd dynamics. Zhan, B; Remagnino, P; Velastin, S; Bremond, F; and Thonnat, M IET Digital Library, 2006.
bibtex   
@article{zhan2006matching,
  title={Matching gradient descriptors with topological constraints to characterise the crowd dynamics},
  author={Zhan, B and Remagnino, P and Velastin, S and Bremond, F and Thonnat, M},
  year={2006},
  publisher={IET Digital Library}
}
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