HÖRMANDER, L. 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://www.mscand.dk/article/view/10486. Acesso em: 1 may. 2024.