ORIENTATION SYSTEM OF PV PANELS AFTER SUN. Journal of Engineering Studies and Research, [S. l.], v. 23, n. 3, p. 19–25, 2017. DOI: 10.29081/jesr.v23i3.76. Disponível em: https://jesr.ub.ro/journal/article/view/76. Acesso em: 13 sep. 2025.