D-Brane Superpotentials in Calabi-Yau Orientifolds
  We develop computational tools for the tree-level superpotential of B-branes in Calabi-Yau orientifolds. Our method is based on a systematic implementation of the orientifold projection in the geometric approach of Aspinwall and Katz. In the process we lay down some ground rules for orientifold projections in the derived category. 
Duiliu-Emanuel Diaconescu, Alberto Garcia-Raboso, Robert L. Karp and   Kuver Sinha