Robust 3D Beamforming for Secure UAV Communications by DAE. - Cuong Pham-Quoc; Vien Nguyen-Duy-Nhat; Mai T. P. Le; Hung Nguyen-Le; Chien Tang-Tan; Tuan Tang-Anh; Nghia Nguyen-Xuan (Mob. Networks Appl., 2023)