SKOLEM, Th. On certain distributions of integers in pairs with given differences. MATHEMATICA SCANDINAVICA, [S. l.], v. 5, p. 57–68, 1957. DOI: 10.7146/math.scand.a-10490. Disponível em: https://tidsskrift.dk/math/article/view/10490. Acesso em: 14 aug. 2026.