BANG, Thoger. On the sequence $[n \alpha]$, $n = 1,2,\dots$. Supplementary note to the preceding paper by Th. Skolem. Mathematica Scandinavica, Berkeley, CA, United States, v. 5, p. 69–76, 1957. DOI: 10.7146/math.scand.a-10491. Disponível em: https://journals.msp.org/mscand/article/view/2828. Acesso em: 8 sep. 2026.