Nazam, Muhammad, Muhammad Arshad, and Mihai Postolache. “Coincidence and Common Fixed Point Theorems for Four Mappings Satisfying (alpha(s),F)-Contraction”. Nonlinear Analysis: Modelling and Control 23, no. 5 (October 22, 2018): 664–690. Accessed May 15, 2024. https://www.journals.vu.lt/nonlinear-analysis/article/view/13158.