Methods improving energy efficiency of photovoltaic systems operating under partial shading / P. Kuznetsov, L. Yuferev, V.A. Panchenko, V. Bolshev, D. Voronin, M. Jasiński, A. Najafi, Z. Leonowicz, L. Martirano // Applied Sciences (Switzerland). – 2021. – Т. 11. – № 22. – P.