Mathematical model of quadratic approximation for optimal power flow in electrical distribution systems. Ciencias de la Ingeniería y Aplicadas, [S. l.], v. 3, n. 2, p. 33–48, 2021. Disponível em: https://investigacion.utc.edu.ec/index.php/ciya/article/view/307. Acesso em: 4 jun. 2026.