WASET
    P. Kiruthika and  K. Ramani,  A Literature Assessment of Multi-Level Inverters.   journal   = {International Journal of Electronics and Communication Engineering}, [online]. World Academy of Science, Engineering and Technology.
    March 2015, vol. 98(2). 226 - 232
    [viewed 26 April 2024]. Available from: https://publications.waset.org/pdf/10000890.