HELFFER, B.; LAI, P. T. Remarque sur la conjecture de Weyl. MATHEMATICA SCANDINAVICA, [S. l.], v. 48, p. 39–40, 1981. DOI: 10.7146/math.scand.a-11896. Disponível em: https://www.mscand.dk/article/view/11896. Acesso em: 4 may. 2024.