Parfinovych, N.V. (2001) “On the Exact Asymptotics of the Best Relative Approximations of Classes of Periodic Functions by Splines”, Ukrains’kyi Matematychnyi Zhurnal, 53(4), pp. 489–500. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/4270 (Accessed: 7 April 2025).