@INPROCEEDINGS {9832,
author={J.   Nascimento and J. Bioucas-Dias},
doi={10.1117/12.799838},
booktitle={SPIE - Conf. on Image and Signal Processing for Remote Sensing},
title={New Developments on VCA Unmixing Algorithm },
year={2008},
month={September},
volume={7109},
pages={71090F-71090F-9} 
}