CARLITZ, L. A special quartic congruence. MATHEMATICA SCANDINAVICA, [S. l.], v. 4, p. 243–246, 1956. DOI: 10.7146/math.scand.a-10472. Disponível em: https://tidsskrift.dk/math/article/view/10472. Acesso em: 14 aug. 2026.