VakarchukS. B. (1996) “On exact order estimates of <em class="a-plus-plus">N</em&gt;-widths of classes of functions analytic in a simply connected domain”, Ukrains’kyi Matematychnyi Zhurnal, 48(4), pp. 543-547. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/5318 (Accessed: 24November2024).