CHEN, C.-M.; CHANG, T.-H. A common fixed point theorem for the $\psi$-contractive mapping. Tamkang Journal of Mathematics, [S. l.], v. 41, n. 1, p. 25–30, 2010. DOI: 10.5556/j.tkjm.41.2010.635. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/635. Acesso em: 3 may. 2024.