ZINCHENKO, T.; MURACH, A. A. Parameter-elliptic operators on the extended Sobolev scale. Methods of Functional Analysis and Topology, [S. l.], v. 19, n. 1, p. 29–39, 2013. Disponível em: https://zen.imath.kiev.ua/index.php/mfat/article/view/533. Acesso em: 16 dec. 2025.