Mahmood Abdullah, Aws. “Generation of PWM Signals for Full Range Speed Control of Three –phase Induction Motor Simulation by Using a Computer”. Journal of Engineering and Sustainable Development, vol. 16, no. 2, June 2012, pp. 53-61, https://jeasd.uomustansiriyah.edu.iq/index.php/jeasd/article/view/1199.