HSIANG, F. C. An inequality for finite sequences. MATHEMATICA SCANDINAVICA, [S. l.], v. 5, p. 12–14, 1957. DOI: 10.7146/math.scand.a-10483. Disponível em: https://www.mscand.dk/article/view/10483. Acesso em: 4 may. 2024.