Functionals: Meta Generalized Gradient Approximation
A meta-GGA functional uses the Laplacian (second derivative) of the density or the kinetic
energy density in addition to the density and the magnitude of the gradient of the density.
Climbing the Density Functional Ladder: Nonempirical Meta-Generalized Gradient
Approximation Designed for Molecules and Solids
J. Tao, J. P. Perdew, V. N. Staroverov, and G. E. Scuseria
Phys. Rev. Lett. 91 146401 (2003) (subscription needed).
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