HSIANG, Fu Cheng. An inequality for finite sequences. Mathematica Scandinavica, Berkeley, CA, United States, v. 5, p. 12–14, 1957. DOI: 10.7146/math.scand.a-10483. Disponível em: https://journals.msp.org/mscand/article/view/2838. Acesso em: 25 jul. 2026.