HÖRMANDER, Lars. Local and global properties of fundamental solutions. Mathematica Scandinavica, Berkeley, CA, United States, v. 5, p. 27–39, 1957. DOI: 10.7146/math.scand.a-10486. Disponível em: https://journals.msp.org/mscand/article/view/2837. Acesso em: 25 jul. 2026.