HEUER, Nicolaus. Low-dimensional bounded cohomology and extensions of groups. Mathematica Scandinavica, Berkeley, CA, United States, v. 126, n. 1, p. 5–31, 2020. DOI: 10.7146/math.scand.a-114969. Disponível em: https://journals.msp.org/mscand/article/view/210. Acesso em: 24 jul. 2026.