@ARTICLE {7221,
author={R.   Ferreira and A. Matos and Gonçalo Morais Morais and R.  Aguiar and Pedro Santos Santos and R. Pereira},
doi={10.1109/TGRS.2006.872907},
journal={IEEE Transactions on Geoscience and Remote Sensing},
title={Multipass},
year={2011},
month={December},
volume={0},
number={9},
pages={76-81},
ISSN={0196-2892}
}