[1]
K. P. R. Sastry, K. K. M. Sarma, P. Krishna Kumari, and Sunitha Choudari, “Fixed Point Theorems for $\psi$-contractions in S-metric Spaces and KKS-metric Spaces”, Int. J. Math. And Appl., vol. 5, no. 4 - E, pp. 619–632, Dec. 2017.