Ganzburg , M. I. “Limiting Theorems for the Best Polynomial Approximations in $L_\infty$ Metrics”. Ukrains’kyi Matematychnyi Zhurnal 43, no. 3 (February 28, 1991): 336–342. Accessed January 12, 2026. https://umj.imath.kiev.ua/index.php/umj/article/view/9612.