Tran Hoang, L., H. Nguyen Huy, A. Phan Huy, T. Truong Xuan, T. Nguyen Thi Thu, and H. Nguyen Thanh. “Optimizing Beamforming Power in Multi-Antenna Transmission With Eavesdroppers”. Journal of Military Science and Technology, no. CBNCT, Nov. 2021, pp. 30-39, https://jmst.mod.gov.vn/index.php/jmst/article/view/2448.