KONO, Akira; MIMURA, Mamoru. Cohomology mod 3 of the classifying space of the Lie group $E_6$. Mathematica Scandinavica, Berkeley, CA, United States, v. 46, p. 223–235, 1980. DOI: 10.7146/math.scand.a-11865. Disponível em: https://journals.msp.org/mscand/article/view/1778. Acesso em: 25 jul. 2026.