@ARTICLE {34,
author={C. A. Fernandes and A. Barbosa},
doi={},
journal={IET Microwaves, Antennas and Propagation},
title={Radiation From a Sheath Helix Excited by a Cicular Waveguide - a Wiener-Hopf Analysis},
year={1990},
month={June},
volume={137},
number={5},
pages={269-275},
ISSN={1751-8725}
}