Hudyma, U. V. (2005) “Best uniform approximation of a continuous compact-valued mapping by sets of continuous single-valued mappings”, Ukrains’kyi Matematychnyi Zhurnal, 57(12), pp. 1601–1618. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3712 (Accessed: 26May2024).