@INPROCEEDINGS {4708,
author={F. M. Janeiro and F. Wagner and P. M. Ramos and A. M. Silva},
doi={},
booktitle={IMEKO TC19 Symp},
title={Automated Atmospheric Visibibility Measurements using a Digital Camera and Image Registration},
year={2007},
month={September},
volume={1},
pages={13-17} 
}