SELMER, Ernst S. On the number of prime divisors of a binomial coefficient. Mathematica Scandinavica, Berkeley, CA, United States, v. 39, p. 271–281, 1976. DOI: 10.7146/math.scand.a-11662. Disponível em: https://journals.msp.org/mscand/article/view/1985. Acesso em: 25 jul. 2026.