HÖRMANDER, Lars. A remark on singular supports of convolutions. Mathematica Scandinavica, Berkeley, CA, United States, v. 45, p. 50–54, 1979. DOI: 10.7146/math.scand.a-11824. Disponível em: https://journals.msp.org/mscand/article/view/1822. Acesso em: 25 jul. 2026.