@ARTICLE{5210209,
title={Audio-Visual Group Recognition Using Diffusion Maps},
author={Keller, Y. and Coifman, R. R. and Lafon, S. and Zucker, S. W.},
journal={Signal Processing, IEEE Transactions on},
year={2010},
month={Jan. },
volume={58},
number={1},
pages={403-413},
doi={10.1109/TSP.2009.2030861},
ISSN={1053-587X}, }