Projection Modification Based Robust Adaptive Backstepping Control for Multipurpose Quadcopter UAV. - Ajeet Kumar Bhatia; Ju Jiang; Ziyang Zhen; Nigar Ahmed; Avinash Rohra (IEEE Access, 2019)

Disturbance Observer Based Tracking Control of Quadrotor With High-Order Disturbances. - Nigar Ahmed; Mou Chen; Shuyi Shao (IEEE Access, 2020)

Robust Composite-Disturbance Observer Based Flight Control of Quadrotor Attitude. - Nigar Ahmed; Abid Raza; Syed Awais Ali Shah; Rameez Khan (J. Intell. Robotic Syst., 2021)