[1]
A. K. Kushpel, “Estimates of the Bernstein widths and their analogs”,
Ukr. Mat. Zhurn.
, vol. 45, no. 1, pp. 54–59, Jan. 1993, Accessed: Apr. 07, 2025. [Online]. Available:
https://umj.imath.kiev.ua/index.php/umj/article/view/5782