@ARTICLE {7792,
author={J. Nascimento and M. A. T. Figueiredo and J. S. Marques},
doi={10.1109/TIP.2012.2226899},
journal={IEEE Transactions on Image Processing},
title={Activity Recognition Using A Mixture of Vector Fields},
year={2013},
month={May},
volume={22},
number={5},
pages={1712-1725},
ISSN={1057-7149}
}