Zhelinski V, Zlatanov B. On the UC and UC$^*$ properties and the existence of best proximity points in metric spaces. Ann. Sofia Univ. Fac. Math. and Inf. [Internet]. 2022 Dec. 12 [cited 2024 Nov. 16];109:121-46. Available from: https://annual.uni-sofia.bg/index.php/fmi/article/view/556