@article{bereyhi2021securing,

title={Securing massive MIMO systems: Secrecy for free with low-complexity architectures},

author={Bereyhi, Ali and Asaad, Saba and M{\"u}ller, Ralf R and Schaefer, Rafael F and Fischer, Georg and Poor, H Vincent},

journal={IEEE Transactions on Wireless Communications},

volume={20},

number={9},

pages={5831--5845},

year={2021},

publisher={IEEE}

}