KLOVE, Torleiv. Noncovering of multiples. MATHEMATICA SCANDINAVICA, [S. l.], v. 43, p. 11–25, 1978. DOI: 10.7146/math.scand.a-11758. Disponível em: https://tidsskrift.dk/math/article/view/11758. Acesso em: 14 aug. 2026.