BabichYu. A., and MichaylovaT. F. “Approximation of Periodic Functions of Many Variables by functions of Smaller Number of Variables in Orlicz Metric Spaces”. Ukrains’kyi Matematychnyi Zhurnal 70, no. 8 (August 25, 2018): 1143-1148. Accessed November 21, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1624.