Lutpi, Mohd Hanif, and Mahyuzie Jenal. “Dual Rotor PMFSM for Counter-Rotating Wind Turbine”. Evolution in Electrical and Electronic Engineering, vol. 4, no. 2, Oct. 2023, pp. 544-51, https://penerbit.uthm.edu.my/periodicals/index.php/eeee/article/view/10342.