1.
Ionescu M, Kumjian A, Renault JN, Sims A, Williams DP. Pushouts of extensions of groupoids by bundles of abelian groups. NZ J Math [Internet]. 2021 Sep. 19 [cited 2024 Oct. 16];52:561-8. Available from: https://nzjmath.org/index.php/NZJMATH/article/view/136