Variational energy functionals of the Green function and of the density tested on molecules

Nils Erik Dahlen, Robert van Leeuwen, Ulf von Barth
2006 Physical Review A. Atomic, Molecular, and Optical Physics  
doi:10.1103/physreva.73.012511 fatcat:2zkjlx6xivfvllwfmzx754ofjq