Satish Kumar Peddapelli,  Recent Advances in Pulse Width Modulation Techniques and Multilevel Inverters .   journal   = {International Journal of Electrical and Computer Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2014, vol. 87(3). 600 - 608
    [viewed 20 May 2022]. Available from: https://publications.waset.org/pdf/9997993.