A new representation of the many body wave function and its application   as a post Hartree-Fock energy variation method
  In this paper, we introduce a new representation of many body electron wave function and a few calculation results of the ground state energies of many body systems using that representation, which is systematically better than the Hartree-Fock approximation. 
Wataru Uemura
cond-mat.other physics.chem-ph