@INPROCEEDINGS {13623,
author={F. Martins and F.M.C. Clemente and M. Couceiro Couceiro},
doi={0},
booktitle={MATHEMATICAL METHODS IN ENGINEERING - MME13},
title={From the individual to the collective analysis at the football game},
year={2013},
month={July},
volume={1},
pages={217-231} 
}