WINTNER, Aurel. On the comparison theorem of Kneser-Hille. Mathematica Scandinavica, Berkeley, CA, United States, v. 5, p. 255–260, 1957. DOI: 10.7146/math.scand.a-10502. Disponível em: https://journals.msp.org/mscand/article/view/2817. Acesso em: 25 jul. 2026.