Nguyen, V.-L. ., D.-B. . Ha, D.-D. . Tran, and Y. . Lee. “Enhancing Physical Layer Security for Cooperative Non-Orthogonal Multiple Access Networks With Artificial Noise”. EAI Endorsed Transactions on Industrial Networks and Intelligent Systems, vol. 6, no. 20, Aug. 2019, p. e4, doi:10.4108/eai.13-7-2018.159945.