LJUNGGREN, Wilhelm. On the Irreducibility of Certain Trinomials and Quadrinomials. Mathematica Scandinavica, Berkeley, CA, United States, v. 8, p. 65–70, 1960. DOI: 10.7146/math.scand.a-10593. Disponível em: https://journals.msp.org/mscand/article/view/2753. Acesso em: 25 jul. 2026.