Ampadu, Clement Boateng. “The Kannan Contraction Mapping Theorem for Composition Operators in Metric Spaces and Partially Ordered Metric Spaces”. Earthline Journal of Mathematical Sciences 3, no. 1 (December 26, 2019): 105-119. Accessed December 27, 2024. https://earthlinepublishers.com/index.php/ejms/article/view/42.