SESHAGIRI RAO, N.; KALYANI, K.; KHATRI, K. Contractive mapping theorems in Partially ordered metric spaces. CUBO, A Mathematical Journal, [S. l.], v. 22, n. 2, p. 203–214, 2020. DOI: 10.4067/S0719-06462020000200203. Disponível em: https://cubo.ufro.cl/ojs/index.php/cubo/article/view/2363. Acesso em: 20 apr. 2024.