ZhyhalloK. M., and KharkevychYu. I. “Complete Asymptotics of the Deviation of a Class of Differentiable Functions from the Set of Their Harmonic Poisson Integrals”. Ukrains’kyi Matematychnyi Zhurnal 54, no. 1 (January 25, 2002): 43-52. Accessed July 27, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4038.