GOLOMB, Solomon W. Sets of primes with intermediate density. Mathematica Scandinavica, Berkeley, CA, United States, v. 3, p. 264–274, 1955. DOI: 10.7146/math.scand.a-10445. Disponível em: https://journals.msp.org/mscand/article/view/2878. Acesso em: 8 sep. 2026.