NS-NS Sector of Closed Superstring Field Theory
  We give a construction for a general class of vertices in superstring field theory which include integration over bosonic moduli as well as the required picture changing insertions. We apply this procedure to find a covariant action for the NS-NS sector of Type II closed superstring field theory. 
Theodore Erler, Sebastian Konopka, Ivo Sachs
hep-th math-ph math.MP