Serdyuk, A. S. (2010) “Approximation of Poisson integrals by de la Valleé-Poussin sums in uniform and integral metrics”, Ukrains’kyi Matematychnyi Zhurnal, 62(12), pp. 1672–1686. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/2991 (Accessed: 6May2024).