Fedunyk-Yaremchuk, O., & Hembars'ka, S. (2019). Estimates of approximative characteristics of the classes $B^{\Omega}_{p,\theta}$ of periodic functions of several variables with given majorant of mixed moduli of continuity in the space $L_{q}$. Carpathian Mathematical Publications, 11(2), 281–295. https://doi.org/10.15330/cmp.11.2.281-295