R.UMAMAHESHWAR RAO. Common fixed point theorem on b-metric space. International Journal of Emerging Trends in Science and Technology, [S. l.], v. 4, n. 08, p. 5600–5603, 2017. Disponível em: http://ijetst.in/index.php/ijetst/article/view/1310. Acesso em: 12 jan. 2025.