Брисіна, І. В., & Макарічев, В. О. (2016). Approximation properties of generalized Fup-functions. Visnyk of V. N. Karazin Kharkiv National University. Ser. Mathematics, Applied Mathematics and Mechanics, 84, 61-92. https://doi.org/10.26565/2221-5646-2016-84-06