Babenko, V. V., Babenko, V. F. and Polishchuk, M. V. (2016) “Approximation of some classes of set-valued periodic functions by generalized trigonometric polynomials”, Ukrains’kyi Matematychnyi Zhurnal, 68(4), pp. 449-459. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/1851 (Accessed: 28April2024).