@INPROCEEDINGS {4313,
author={M.  Ribeiro and C. R. Paiva},
doi={},
booktitle={Metamorphose International Congress on Advanced Electromagnetic Materials in Microwaves and Optics - METAMATERIALS},
title={An equivalence principle for electromagnetism using geometric algebra},
year={2007},
month={October},
volume={-},
pages={---} 
}