CHUGH, R.; SAVITA, . Common Fixed Points of Four R-Weakly Commuting Mappings. The Journal of the Indian Mathematical Society, [S. l.], v. 70, n. 1-4, p. 185–189, 2003. Disponível em: https://www.informaticsjournals.com/index.php/jims/article/view/21945. Acesso em: 3 may. 2024.