MURACH, A. A.; KASIRENKO, T. Elliptic problems with boundary operators of higher orders in Hörmander–Roitberg spaces. Methods of Functional Analysis and Topology, [S. l.], v. 24, n. 2, p. 120–142, 2018. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/690. Acesso em: 15 dec. 2025.