@INPROCEEDINGS {11109,
author={R. D. Fernandes and A. Boaventura and N.B.C. Carvalho and J. M.  Matos},
doi={10.1109/RFID-TA.2011.6068599 },
booktitle={IEEE International Conf. on RFID-Technology and Applications},
title={Increasing the range of wireless passive sensor nodes using multisines},
year={2011},
month={September},
volume={1},
pages={549-553} 
}