Dubouloz A, Hedén I, Kishimoto T. Equivariant extensions of $\mathbb{G}_a$-torsors over punctured surfaces . Annali Scienze [Internet]. 2020Dec.21 [cited 2025May26];21(special, 1-2):133-67. Available from: http://20.103.181.36/index.php/annaliscienze/article/view/904