R. A. RASHWAN; S. M. SALEH. Some common fixed point theorems for four $(\psi,\varphi)$-weakly contractive mappings satisfying rational expressions in ordered partial metric spaces. **International Journal of Mathematics And its Applications**, *[S. l.]*, v. 2, n. 3, p. 29–51, 2014. Disponível em: http://ijmaa.in/index.php/ijmaa/article/view/309. Acesso em: 24 sep. 2023.