JENSEN, Chr. U. Über die Führer einer Klasse Heckescher Grössencharaktere. Mathematica Scandinavica, Berkeley, CA, United States, v. 8, p. 81–96, 1960. DOI: 10.7146/math.scand.a-10595. Disponível em: https://journals.msp.org/mscand/article/view/2751. Acesso em: 25 jul. 2026.