Team, S. “Generalization of Fixed Point Results of Contractive Maps by Altering Distances : G.V.R. Babu, P. Subhashini”. Thai Journal of Mathematics, vol. 11, no. 2, Aug. 2013, pp. 447-59, https://thaijmath2.in.cmu.ac.th/index.php/thaijmath/article/view/391.