Sarnmeta, Panitarn, and Suthep Suantai. “Existence and Convergence Theorems For Best Proximity Points of Proximal Multi-Valued Nonexpansive Mappings”. Communications in Mathematics and Applications, vol. 10, no. 3, Sept. 2019, pp. 369-77, https://doi.org/10.26713/cma.v10i3.1199.