The Local Density Approximation (LDA) is discussed in the following articles:

- The LDA was proposed already in one of the very first articles on DFT,
**Self-Consistent Equations Including Exchange and Correlation Effects**

W. Kohn and L.J. Sham,

Phys. Rev. 140, A1133 (1965) (subscription needed). - Exchange: In LDA the exchange energy per particle in each spatial point is taken as the exchange energy per particle from a uniform electron gas with a density equivalent to the density in this same point.
- Correlation: Originally Wigner correlation was used in LDA.
- Correlation: In 1980, Ceperly and Alder (
**CA**) published a study of the total energy of a uniform electron gas,**Ground State of the Electron Gas by a Stochastic Method**

D. M. Ceperley and B. J. Alder,

Phys. Rev. Lett. 45, 566 (1980) (subscription needed).

All modern correlation energies per particle are parametrizations of the CA data.**VWN**:**Accurate spin-dependent electron liquid correlation energies for local spin density calculations: a critical analysis**

S. H. Vosko, L. Wilk, and M. Nusair

Can. J. Phys.**58**, 1200 (1980).

A copy of this article can be obtained here.**PZ**:**Self-interaction correction to density-functional approximations for many-electron systems**

J. P. Perdew and Alex Zunger

Phys. Rev. B 23, 5048 (1981) (subscription needed).**PW**:**Accurate and simple analytic representation of the electron-gas correlation energy**

J. P. Perdew and Y. Wang

Phys. Rev. B 45, 13244 (1992) (subscription needed).