GROSS, K. B. A product theorem for Skolem sequences. MATHEMATICA SCANDINAVICA, [S. l.], v. 38, p. 262–264, 1976. DOI: 10.7146/math.scand.a-11633. Disponível em: https://www.mscand.dk/article/view/11633. Acesso em: 6 may. 2024.