NANDLAL, .; KUMAR, P. Spectrum of Certain Unbounded Composition Transformations in l². The Journal of the Indian Mathematical Society, [S. l.], v. 71, n. 1-4, p. 125–129, 2004. Disponível em: http://informaticsjournals.com/index.php/jims/article/view/22037. Acesso em: 2 oct. 2024.