SINTUNAVARAT, W.; KUMAM, P. PPF DEPENDENT FIXED POINT THEOREMS FOR RATIONAL TYPE CONTRACTION MAPPINGS IN BANACH SPACES. Journal of Nonlinear Analysis and Optimization: Theory & Applications (JNAO), [S. l.], v. 4, n. 2, p. 157–162, 2013. Disponível em: https://ph03.tci-thaijo.org/index.php/jnao/article/view/2712. Acesso em: 2 sep. 2026.