@INPROCEEDINGS {7308,
author={S.A. Matos and C. R. Paiva and A. Barbosa},
doi={},
booktitle={Conf. on Telecommunications  - ConfTele},
title={Optic axes of general anisotropic media: a geometric algebra perspective},
year={2009},
month={May},
volume={-},
pages={---} 
}