Konohrai AF. Estimates for the approximate characteristics of the classes $B_{p, \theta}^{\Omega}$ of periodic functions of two variables with given majorant of mixed moduli of continuity. Ukr. Mat. Zhurn. [Internet]. 2011Feb.25 [cited 2024Apr.27];63(2):176-8. Available from: https://umj.imath.kiev.ua/index.php/umj/article/view/2709