MYDLARCZYK, W. The existance of nontrival solutions of Volterra equations. Mathematica Scandinavica, Berkeley, CA, United States, v. 68, p. 83–88, 1991. DOI: 10.7146/math.scand.a-12347. Disponível em: https://journals.msp.org/mscand/article/view/1286. Acesso em: 24 jul. 2026.