Bodenchuk, V. V., and A. S. Serdyuk. “Exact Values of Kolmogorov Widths for the Classes of Analytic Functions. II”. Ukrains’kyi Matematychnyi Zhurnal 67, no. 8 (August 25, 2015): 1011-1018. Accessed April 25, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2041.