KAPANADZE, D. V. On the uniqueness of a solution of the problem with oblique derivative for the equation Δ n v = 0. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 58, n. 6, p. 835–841, 2006. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3499. Acesso em: 6 dec. 2025.