Qureshi, Muhammad Razaullah, et al. “Harmonic Analysis and Design of LC Filter for a Seven-Level Asymmetric Cascaded Half Bridge Multilevel Inverter”. International Journal of Electrical Engineering & Emerging Technology , vol. 3, no. 2, Dec. 2020, pp. 52-58, https://oldarchive.ijeeet.com/index.php/ijeeet/article/view/46.