SerdyukA. S. (2004) “Approximation of Poisson Integrals by de la Vallée Poussin Sums”, Ukrains’kyi Matematychnyi Zhurnal, 56(1), pp. 97-107. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/3731 (Accessed: 24November2024).