Romanyuk A. S., & YanchenkoS. Y. (2022). Kolmogorov widths of the Nikol’skii – Besov classes of periodic functions of many variables in the space of quasi-continuous functions. Ukrains’kyi Matematychnyi Zhurnal, 74(2), 220 - 232. https://doi.org/10.37863/umzh.v74i2.6932