On Kothe-Toeplitz and Null Duals of Some Difference Sequence Spaces Defined by Orlicz Functions. European Journal of Pure and Applied Mathematics, Maryland, USA, v. 2, n. 4, p. 554–563, 2009. Disponível em: https://www.ejpam.com/index.php/ejpam/article/view/178.. Acesso em: 3 may. 2024.