@INPROCEEDINGS {7926,
author={J.   Nascimento and J. Bioucas-Dias},
doi={10.1117/12.830492},
booktitle={SPIE - Conf. on Image and Signal Processing for Remote Sensing},
title={Nonlinear Mixture Model for Hyperspectral Unmixing},
year={2009},
month={September},
volume={7477},
pages={74770I-74770I-8} 
}