LAL, N.; TRIPATHI, G. P. Composition Operators on l² of The form "Normal Plus Compact". The Journal of the Indian Mathematical Society, [S. l.], v. 72, n. 1-4, p. 221–226, 2005. Disponível em: https://www.informaticsjournals.com/index.php/jims/article/view/21834. Acesso em: 29 apr. 2024.