1. Motivic degree zero Donaldson-Thomas invariants;Behrend, Kai;Invent. Math.,2013
2. On the motivic class of the stack of bundles;Behrend, Kai;Adv. Math.,2007
3. Torsten Ekedahl, A geometric invariant of a finite group. arXiv:math/0903.3148.
4. Torsten Ekedahl, The Grothendieck group of algebraic stacks. arXiv:math/0903.3143.
5. Pairs of commuting matrices over a finite field;Feit, Walter;Duke Math. J.,1960