Mokhtar, Nur Hadibah, and Roziah Aziz. “Partial Irreversible Demagnetization Reduction of Permanent Magnet Synchronous Motor”. Evolution in Electrical and Electronic Engineering, vol. 3, no. 1, June 2022, pp. 106-13, https://penerbit.uthm.edu.my/periodicals/index.php/eeee/article/view/7017.