HEUER, N. Cup product in bounded cohomology of the free group . ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, [S. l.], v. 21, n. special, 1-2, p. 1-26, 2020. DOI: 10.2422/2036-2145.201802_007. Disponível em: https://journals.sns.it/index.php/annaliscienze/article/view/901. Acesso em: 20 feb. 2026.