VakarchukS. B. “Widths of Classes of Functions in the Weight Space $L_{2,\gamma}(\mathbb{R}), \gamma=\exp(-x^2)$”. Ukrains’kyi Matematychnyi Zhurnal 74, no. 5 (June 17, 2022): 610 - 619. Accessed November 21, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/7147.