@INPROCEEDINGS {12963,
author={J. Cóias and J. Sanguino and P. O. Oliveira},
doi={},
booktitle={ESA Workshop on Satellite Navigation User Equipment Technologies (NAVITEC)},
title={Quaternion Estimation for Attitude Determination Using Multiple L1 GPS Receivers},
year={2012},
month={December},
volume={--},
pages={-----} 
}