GRUBB, G.; HÖRMANDER, L. The transmission property. MATHEMATICA SCANDINAVICA, [S. l.], v. 67, p. 273–289, 1990. DOI: 10.7146/math.scand.a-12338. Disponível em: https://www.mscand.dk/article/view/12338. Acesso em: 23 nov. 2024.