KLOVE, Torleiv. A class of symmetric 2-bases. Mathematica Scandinavica, Berkeley, CA, United States, v. 47, p. 177–180, 1980. DOI: 10.7146/math.scand.a-11883. Disponível em: https://journals.msp.org/mscand/article/view/1760. Acesso em: 25 jul. 2026.