On isolated points of the approximate point spectrum of a closed linear relation. Extracta Mathematicae, [S. l.], v. 37, n. 1, p. 75–90, 2022. DOI: 10.17398/2605-5686.37.1.75. Disponível em: https://revista-em.unex.es/index.php/EM/article/view/2605-5686.37.1.75.. Acesso em: 21 nov. 2024.