GHAZARYAN, H. On selection of infinitely differentiable solutions of a class of partially hypoelliptic equations. Eurasian Mathematical Journal, [S. l.], v. 3, n. 1, p. 41–62, 2012. Disponível em: https://emj.enu.kz/index.php/main/article/view/773. Acesso em: 21 nov. 2025.