On the spectral properties of Non- selfadjoint Elliptic Differential Operators in Hilbert space. Advances in the Theory of Nonlinear Analysis and its Application, [S. l.], v. 4, n. 4, p. 316–320, 2023. Disponível em: https://mail.atnaea.org/index.php/journal/article/view/139.. Acesso em: 19 apr. 2026.