TVERBERG, Helge. On two Inequalities by S. Selberg. Mathematica Scandinavica, Berkeley, CA, United States, v. 6, p. 308–310, 1958. DOI: 10.7146/math.scand.a-10557. Disponível em: https://journals.msp.org/mscand/article/view/2788. Acesso em: 25 jul. 2026.