Vakarchuk, S.B. (2000) “On the best approximation in the mean and overconvergence of a sequence of polynomials of the best approximation”, Ukrains’kyi Matematychnyi Zhurnal, 52(1), pp. 35–45. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4394 (Accessed: 17 February 2026).