MYDLARCZYK, W. The existance of nontrival solutions of Volterra equations. MATHEMATICA SCANDINAVICA, [S. l.], v. 68, p. 83–88, 1991. DOI: 10.7146/math.scand.a-12347. Disponível em: https://www.mscand.dk/article/view/12347. Acesso em: 27 apr. 2024.