DUBOULOZ, A.; HEDÉN, I.; KISHIMOTO, T. Equivariant extensions of $\mathbb{G}_a$-torsors over punctured surfaces . ANNALI SCUOLA NORMALE SUPERIORE - CLASSE DI SCIENZE, [S. l.], v. 21, n. special, 1-2, p. 133-167, 2020. DOI: 10.2422/2036-2145.201710_002. Disponível em: http://20.103.181.36/index.php/annaliscienze/article/view/904. Acesso em: 27 may. 2025.