Mohd Basri, Mohd Ariffanan, Mohamad Shukri Zainal Abidin, and Nurul Adilla Mohd Subha. 2018. “Simulation of Backstepping-Based Nonlinear Control for Quadrotor Helicopter”. Applications of Modelling and Simulation 2 (1):34-40. http://arqiipubl.com/ojs/index.php/AMS_Journal/article/view/19.