@ARTICLE {18901,
author={T. Varum and J. M.  Matos and P. Pinho and R. Abreu},
doi={10.1109/TVT.2015.2500520},
journal={IEEE Transactions on Vehicular Technology},
title={Nonuniform Broadband Circularly Polarized Antenna Aray for Vehicular Communications},
year={2016},
month={September},
volume={65},
number={9},
pages={7219-7227},
ISSN={0018-9545}
}