BALSER, W. Summation of Formal Power Series Through Iterated Laplace Integrals. MATHEMATICA SCANDINAVICA, [S. l.], v. 70, p. 161–171, 1992. DOI: 10.7146/math.scand.a-12392. Disponível em: https://www.mscand.dk/article/view/12392. Acesso em: 5 may. 2024.