Behih, K., and H. Attoui. “Backstepping Terminal Sliding Mode MPPT Controller for Photovoltaic Systems”. Engineering, Technology & Applied Science Research 11, no. 2 (April 11, 2021): 7060–7067. Accessed July 6, 2022. https://www.etasr.com/index.php/ETASR/article/view/4101.