[1]
P. V. Zaderei, “Approximation of $(\bar \psi ,\bar \beta )$ -differentiable periodic functions of many variables”, Ukr. Mat. Zhurn., vol. 45, no. 3, pp. 367–377, Mar. 1993, Accessed: Dec. 05, 2025. [Online]. Available: https://umj.imath.kiev.ua/index.php/umj/article/view/5818