MIKHAILETS, V. A.; MURACH, A. A. Improved scales of spaces and elliptic boundary-value problems. I. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 58, n. 2, p. 217–235, 2006. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3448. Acesso em: 27 apr. 2025.