HÖRMANDER, Lars. Local and global properties of fundamental solutions. MATHEMATICA SCANDINAVICA, [S. l.], v. 5, p. 27–39, 1957. DOI: 10.7146/math.scand.a-10486. Disponível em: https://tidsskrift.dk/math/article/view/10486. Acesso em: 14 aug. 2026.