1. Chiral Algebras;Beilinson,2004
2. Heat Kernels and Dirac Operators;Berline,1992
3. Vertex algebras and mirror symmetry;Borisov;Comm. Math. Phys.,2001
4. Chiral differential operators on supermanifolds;Cheung;Math. Z.,2012
5. A geometric construction of the Witten genus I;Costello,2010