HIEU, N. T.; HANG, V. T. L. COUPLED FIXED POINT THEOREMS FOR GENERALIZED $\alpha-\psi$-CONTRACTIVE MAPPINGS IN PARTIALLY ORDERED METRIC-TYPE SPACES. Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO), [S. l.], v. 7, n. 2, p. 35–49, 2018. Disponível em: https://ph03.tci-thaijo.org/index.php/jnao/article/view/2830. Acesso em: 2 sep. 2026.