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Really enjoyed the relationship between this paper's title and the graph of its citation frequency:

http://i.imgur.com/RO6BVRx.png

Then dive right in!

https://sites.google.com/site/markcasida/dft

I think it would have been useful to have the graph reflect discipline's color.

The Perdew-Burke-Enzerhof functional, and the generalized gradient approximation, is a Big Honking Deal for accurate quantum-mechanical simulation of solids.

For more: http://en.wikipedia.org/wiki/Density_functional_theory

(I used to be a happy customer, back when I was a scientist.)

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