PRAJISHA, E.; SHAINI, P. $FG$-coupled fixed point theorems in cone metric spaces. Carpathian Mathematical Publications, [S. l.], v. 9, n. 2, p. 163–170, 2018. DOI: 10.15330/cmp.9.2.163-170. Disponível em: https://scijournals.pnu.edu.ua/index.php/cmp/article/view/1460. Acesso em: 9 may. 2024.