BUGIR, M.K. Theorems on the average values and non-oscillating character of the solutions of the partial differential equations in the spaces $E^n$ and $P^n$ . Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 44, n. 11, p. 1477–1483, 2024. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/8248. Acesso em: 5 dec. 2025.