A. Nouaiti, A. Mesbahi, A. Saad, M. Khafallah, and M. Reddak, “Realization of a Single-Phase Multilevel Inverter for Grid-Connected Photovoltaic System”, Eng. Technol. Appl. Sci. Res., vol. 8, no. 5, pp. 3344–3349, Oct. 2018.