K. P. R. SASTRY; K. K. M. SARMA; S. LAKSHMANA RAO. A Fixed Point Theorem for Four Self Maps on a Multiplicative Metric Space and Consequences. International Journal of Mathematics And its Applications, [S. l.], v. 6, n. 1 - B, p. 215–221, 2018. Disponível em: http://ijmaa.in/index.php/ijmaa/article/view/917. Acesso em: 9 may. 2024.