HELFFER, B.; LAI, Pham The. Remarque sur la conjecture de Weyl. Mathematica Scandinavica, Berkeley, CA, United States, v. 48, p. 39–40, 1981. DOI: 10.7146/math.scand.a-11896. Disponível em: https://journals.msp.org/mscand/article/view/1730. Acesso em: 25 jul. 2026.