VAROPOULOS, N. Th. Sidon sets in $\mathsf{R}^n$. Mathematica Scandinavica, Berkeley, CA, United States, v. 27, p. 39–49, 1970. DOI: 10.7146/math.scand.a-10985. Disponível em: https://journals.msp.org/mscand/article/view/2341. Acesso em: 25 jul. 2026.