@INPROCEEDINGS {24466,
author={T. Varum and J. M.  Matos and P. Pinho},
doi={},
booktitle={Conf. on Telecommunications  - ConfTele},
title={Microstrip antenna array for a new tolling approach in highways access},
year={2015},
month={September},
volume={1},
pages={1-4} 
}