@INPROCEEDINGS {8118,
author={J. J. Júdice and A.  Almeida and L. M. Fernandes and J.  Patrício},
doi={},
booktitle={Conf. on Telecommunications  - ConfTele},
title={On the computation of a nonnegative matrix factorization and its application in telecommunications},
year={2009},
month={May},
volume={},
pages={485-488} 
}