GHAFFARI, A. The modulus of operators on group algebras. Tamkang Journal of Mathematics, [S. l.], v. 35, n. 2, p. 95-100, 2004. DOI: 10.5556/j.tkjm.35.2004.209. Disponível em: https://journals.math.tku.edu.tw/index.php/TKJM/article/view/209. Acesso em: 29 may. 2022.