Y. Laxmi Narasimha Rao, Dr.G.Ravindranath. “Direct Self Control-Space Vector Pulse Width Modulation Technique for Speed Control of Induction Motor Using Five Level NPDC Inverter and Sample Reference Phase Voltages”. Drugs and Cell Therapies in Hematology, vol. 10, no. 1, Aug. 2021, pp. 1529-36, http://dcth.org/index.php/journal/article/view/299.