HEWITT, Edwin. The Ranges of Certain Convolution Operators. Mathematica Scandinavica, Berkeley, CA, United States, v. 15, p. 147–155, 1964. DOI: 10.7146/math.scand.a-10738. Disponível em: https://journals.msp.org/mscand/article/view/2606. Acesso em: 25 jul. 2026.