RESSEL, P. Integral representations on convex semigroups. MATHEMATICA SCANDINAVICA, [S. l.], v. 61, p. 93–111, 1987. DOI: 10.7146/math.scand.a-12192. Disponível em: https://www.mscand.dk/article/view/12192. Acesso em: 14 apr. 2025.