GRUBB, Gerd; HÖRMANDER, Lars. The transmission property. MATHEMATICA SCANDINAVICA, [S. l.], v. 67, p. 273–289, 1990. DOI: 10.7146/math.scand.a-12338. Disponível em: https://tidsskrift.dk/math/article/view/12338. Acesso em: 14 aug. 2026.