HÖRMANDER, Lars. A remark on singular supports of convolutions. MATHEMATICA SCANDINAVICA, [S. l.], v. 45, p. 50–54, 1979. DOI: 10.7146/math.scand.a-11824. Disponível em: https://tidsskrift.dk/math/article/view/11824. Acesso em: 14 aug. 2026.