Towards Integrability of Topological Strings I: Three-forms on   Calabi-Yau manifolds
  The precise relation between Kodaira-Spencer path integral and a particular wave function in seven dimensional quadratic field theory is established. The special properties of three-forms in 6d, as well as Hitchin's action functional, play an important role. The latter defines a quantum field theory similar to Polyakov's formulation of 2d gravity; the curious analogy with world-sheet action of bosonic string is also pointed out. 
Anton A. Gerasimov and Samson L. Shatashvili