HEMBARS'KA, S. B. On boundary values of three-harmonic Poisson integral on the boundary of a unit disk. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 70, n. 7, p. 876–884, 2018. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/1602. Acesso em: 5 dec. 2025.