@INPROCEEDINGS {28268,
author={R.  Correia and N.B.C. Carvalho},
doi={},
booktitle={Conf. on Telecommunications  - ConfTele},
title={State of art in Passive Backscatter Wireless Sensor Networks with Wireless Power Transmission},
year={2015},
month={September},
volume={-},
pages={1-4} 
}