MURACH, A. A. Elliptic boundary-value problems in complete scales of Nikol’skii-type spaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 46, n. 12, p. 1647–1654, 1994. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/5575. Acesso em: 6 dec. 2025.