MaslyuchenkoV. K., and Mel’nikV. S. “Construction of Intermediate Differentiable Functions”. Ukrains’kyi Matematychnyi Zhurnal 70, no. 5 (May 25, 2018): 672-681. Accessed November 23, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/1586.