POPA, Valeriu. A general fixed point theorem for two pairs of absorbing mappings in Gp-metric spaces. Annales Mathematicae Silesianae, [S. l.], v. 34, n. 2, p. 268–285, 2020. Disponível em: https://journals.us.edu.pl/index.php/AMSIL/article/view/13617. Acesso em: 5 dec. 2025.