Density Functionals

David J. Tozer, Nicholas C. Handy, and William H. Green, "Exchange-Correlation Functionals from Ab Initio Electron Densities" Chemical Physics Letters 273, 183-194 (1997). link to paper

William H. Green, David J. Tozer, and Nicholas C. Handy, "Learnings from Exchange-Correlation Potentials", Chemical Physics Letters 290, 465 (1998). link to paper