LangarshoevM. R. “On the Best Linear Methods of Approximation and the Exact Values of Widths for Some Classes of Analytic Functions in the Weighted Bergman Space”. Ukrains’kyi Matematychnyi Zhurnal 67, no. 10 (October 25, 2015): 1366-1379. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/2073.