Nantadilok, Jamnian, and Chainarong Khunpanuk. “Best Proximity Points for Cyclic Contractions in CAT(0) Spaces”. Communications in Mathematics and Applications 12, no. 2 (June 30, 2021): 231–240. Accessed May 2, 2024. https://www.rgnpublications.com/journals/index.php/cma/article/view/1470.