The spectra of certain nonlinear superposition operators in the spaces of sequences. Gulf Journal of Mathematics, [S. l.], v. 5, n. 2, 2017. DOI: 10.56947/gjom.v5i2.94. Disponível em: https://gjom.org/index.php/gjom/article/view/94. Acesso em: 28 aug. 2026.