The topological sigma model

@article{Baulieu1989TheTS,
  title={The topological sigma model},
  author={Laurent Baulieu and Isadore Manuel Singer},
  journal={Communications in Mathematical Physics},
  year={1989},
  volume={125},
  pages={227-237}
}
We obtain the invariants of Witten's topologicalσ-model by gauge fixing a topological action and using BRST symmetry. The fields and the BRST formalism are interpreted geometrically. 
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