SKOVGAARD, H. On inequalities of the Turán type. Mathematica Scandinavica, Berkeley, CA, United States, v. 2, p. 65–73, 1954. DOI: 10.7146/math.scand.a-10396. Disponível em: https://journals.msp.org/mscand/article/view/2930. Acesso em: 25 jul. 2026.