S. B. Hembars’ka, . (2023) “About marginal values of three-harmonic Poisson integral on the bound of the unit disk”, Ukrains’kyi Matematychnyi Zhurnal, 70(7), pp. 876–884. Available at: https://umj.imath.kiev.ua/index.php/umj/article/view/6031 (Accessed: 5 December 2025).