YOLACAN, E.; KIZILTUNC, H.; KIR, M. Coincidence point theorems for $\varphi$-$\psi$-contraction mappings in metric spaces involving a graph. Carpathian Mathematical Publications, [S. l.], v. 8, n. 2, p. 251–262, 2016. DOI: 10.15330/cmp.8.2.251-262. Disponível em: https://scijournals.pnu.edu.ua/index.php/cmp/article/view/1431. Acesso em: 8 may. 2024.