Zhou, Mi, Xiao-Lan Liu, and Adrian Secelean. “On Coincidence and Common Fixed Point Theorems of Eight Self-Maps Satisfying an FM-Contraction Condition”. Nonlinear Analysis: Modelling and Control 24, no. 6 (November 7, 2019): 1001–1018. Accessed July 27, 2025. https://www.zurnalai.vu.lt/nonlinear-analysis/article/view/14848.