Gulzar, D. M., S. Ahmad, D. U. Shami, D. S. Murawwat, and A. Jameel. “An Improved PWM Technique to Reduce Total Harmonic Distortion of Multilevel Inverters”. Technical Journal, Vol. 25, no. 01, Apr. 2020, pp. 8-14, https://tj.uettaxila.edu.pk/index.php/technical-journal/article/view/1082.