KolyadaV. I. “Mean Oscillations and the Convergence of Poisson Integrals”. Ukrains’kyi Matematychnyi Zhurnal 49, no. 2 (February 25, 1997): 206–222. Accessed November 24, 2024. https://umj.imath.kiev.ua/index.php/umj/article/view/4998.