ZhyhalloT. V., and KharkevychYu. I. “Approximation of Functions Defined on the Real Axis by Operators Generated by λ-Methods of Summation of Their Fourier Integrals”. Ukrains’kyi Matematychnyi Zhurnal 56, no. 9 (September 25, 2004): 1267-1280. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/3840.