SATO, K.- ichi. A remark on the criteria for 3 to be a ninth power (mod $p$). MATHEMATICA SCANDINAVICA, [S. l.], v. 60, p. 148–150, 1987. DOI: 10.7146/math.scand.a-12177. Disponível em: https://www.mscand.dk/article/view/12177. Acesso em: 28 apr. 2024.