SEARCH Articles Figures Tables Approximate exchange functionals Approximating functions Approximation function Correlation function exchange Correlation function localization Correlation local density approximations Density approximate Density correlation Density correlation function Density functional approximation Exchange approximate Exchange approximation Exchange correlation Exchange correlation functional Exchange density Exchange function Exchange functionals Exchange-density functionals Function localization Local Correlation Local approximation Local correlation approximations Local density approximation Local density approximation exchange-correlation Local density functional Local density functionals Local exchange Local functionals Localized functions