Spectral Properties of an Energy-Dependent Hamiltonian. Communications in Mathematical Research, [S. l.], v. 37, n. 2, p. 141–179, 2021. DOI: 10.4208/cmr.2020-0040. Disponível em: https://global-sci.com/index.php/cmr/article/view/9047. Acesso em: 5 dec. 2025.