Hybrid Formalism, Supersymmetry Reduction, and Ramond-Ramond Fluxes
  The supersymmetric hybrid formalism for Type II strings is used to study partial supersymmetry breaking in four and three dimensions. We use worldsheet techniques to derive effects of internal Ramond-Ramond fluxes such as torsions, superpotentials and warping. 
William D. Linch III and Brenno Carlini Vallilo