MIKHAILETS, V. A.; MURACH, A. A. Elliptic Operators in a Refined Scale of Functional Spaces. Ukrains’kyi Matematychnyi Zhurnal, [S. l.], v. 57, n. 5, p. 689–696, 2005. Disponível em: https://umj.imath.kiev.ua/index.php/umj/article/view/3635. Acesso em: 5 dec. 2025.