Брисіна, І. В., and В. О. Макарічев. “Approximation Properties of Generalized Fup-Functions”. Visnyk of V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics 840 (December 12, 2016): 61-92. Accessed April 25, 2024. https://periodicals.karazin.ua/mech_math/article/view/8566.