Fedunyk-Yaremchuk O, Hembars’ka S. Approximation of classes of periodic functions of several variables with given majorant of mixed moduli of continuity. Carpathian Math. Publ. [Internet]. 2021 Dec. 30 [cited 2024 May 2];13(3):838-50. Available from: https://scijournals.pnu.edu.ua/index.php/cmp/article/view/5641