S. B. Hembars’ka. “About Marginal Values of Three-Harmonic Poisson Integral on the Bound of the Unit Disk”. Ukrains’kyi Matematychnyi Zhurnal 70, no. 7 (July 19, 2023): 876–884. Accessed December 5, 2025. https://umj.imath.kiev.ua/index.php/umj/article/view/6031.