@INPROCEEDINGS {1939,
author={L. M. Correia and A. Barbosa},
doi={},
booktitle={IEEE AP-S/URSI International Symp.},
title={An approximate (symmetric) magnetic field integral equation for the analysis of scattering by conducting bodies},
year={1990},
month={June},
volume={2},
pages={902-905} 
}