@ARTICLE {28271,
author={S.  Daskalakis and R.  Correia and G. Goussetis and MT Tentzeris and N.B.C. Carvalho and A. G. Georgiadis},
doi={10.1109/TMTT.2018.2879105},
journal={IEEE Transactions on Microwave Theory and Techniques},
title={Four-PAM Modulation of Ambient FM Backscattering for Spectrally Efficient Low-Power Applications},
year={2018},
month={December},
volume={66},
number={12},
pages={5909-5921},
ISSN={0018-9480}
}