Bonding properties of IIA and IIB dimers in density functional theory with gradient corrections to the local density approximationG. Ortiz; P. Ballone · 1991

Corrections to the Local Density Approximation: Gradient Expansion versus Wave-Vector Analysis for the Metallic Surface ProblemPerdew, J. P.; Langreth, D. C.; Sahni, V. · Physical Review Letters · 1977

On the required shape corrections to the local density and generalized gradient approximations to the Kohn–Sham potentials for molecular response calculations of (hyper)polarizabilities and excitation energiesGrüning, Myrta; Gritsenko, Oleg V.; van Gisbergen, Stan J. A.; Jan Baerends, Evert · The Journal of Chemical Physics · 2002