PANKOV, Alexander. Discrete almost periodic operators. CUBO, A Mathematical Journal, [S. l.], v. 15, n. 1, p. 171–189, 2013. DOI: 10.4067/S0719-06462013000100012. Disponível em: https://cubo.ufro.cl/index.php/cubo/article/view/1327. Acesso em: 12 oct. 2025.