KHAN, M.; RAO, K.; RAO, K. Some fixed point theorems in symmetric G-cone metric spaces. Eurasian Mathematical Journal, [S. l.], v. 3, n. 2, p. 85–93, 2012. Disponível em: https://emj.enu.kz/index.php/main/article/view/793. Acesso em: 18 sep. 2025.