Mohd Zamurina, Nurul Nabila, and Roziah Aziz. “A Method of Reducing Cogging Torque by Using Magnet Shifting Angle in Permanent Magnet Motor”. Evolution in Electrical and Electronic Engineering, vol. 3, no. 1, June 2022, pp. 490-4, https://penerbit.uthm.edu.my/periodicals/index.php/eeee/article/view/6709.