@ARTICLE {28100,
author={X.  Zhai and X.  Guan and J.  Yuan and H.  Liu and J. R. Rodrigues},
doi={10.1007/s11036-017-0951-5},
journal={Mobile Networks and Applications},
title={Energy-Efficiency Maximization with Non-linear Fractional Programming for Intelligent Device-to-Device Communications},
year={2018},
month={April},
volume={23},
number={2},
pages={308-317},
ISSN={1383-469X}
}