KENTLI, F.; YILMAZ, M. Mathematical Modelling of Two-axis Photovoltaic System with Improved Efficiency. Elektronika ir Elektrotechnika, [S. l.], v. 21, n. 4, p. 40-43, 2015. DOI: 10.5755/j01.eee.21.4.12780. Disponível em: https://eejournal.ktu.lt/index.php/elt/article/view/12780. Acesso em: 30 sep. 2022.