GRIPENBERG, Gustaf. Unique solutions of some Voltera integral equations. Mathematica Scandinavica, Berkeley, CA, United States, v. 48, p. 59–67, 1981. DOI: 10.7146/math.scand.a-11899. Disponível em: https://journals.msp.org/mscand/article/view/1729. Acesso em: 25 jul. 2026.