Hill-Type Formula and Krein-Type Trace Formula for Hamiltonian Systems. Analysis in Theory and Applications, [S. l.], v. 37, n. 1, p. 74–101, 2022. DOI: 10.4208/ata.2021.pr80.09. Disponível em: https://global-sci.com/index.php/ata/article/view/8214. Acesso em: 6 dec. 2025.