MPPT-based backstepping control for a grid connected fuel cell system using high step-up converter. - Fadwa El Otmani; Abdelmajid Abouloifa; Meriem Aourir; Fatimazahraa Assad; Karim Noussi; Hanane Katir; Ibtissam Lachkar (Int. J. Model. Identif. Control., 2021)