MIKHAILETS, V. A.; MURACH, A. A. Improved scales of spaces and elliptic boundary-value problems. III. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 59, n. 5, p. 679–701, 2007. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3338. Acesso em: 6 dec. 2025.