CASCADE PID-LQR CONTROL STRATEGY FOR NONLINEAR FLEXIBLE INVERTED PENDULUM SYSTEM. - Thi-Hong-Lam Le; Khanh-Hung Pham; Dinh-Luan Pham; Gia-Dat Tong; Le-Thanh-Dat Nguyen; Trinh-Anh-Tuan Ngo; Xuan-Tuan Le; Minh-Tuan Nguyen (Robotica & Management, 2024)