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Phys. Rev. B 79, 085104 (2009)
Calculation of the lattice constant of solids with semilocal functionals
http://link.aps.org/doi/10.1103/PhysRevB.79.085104

2.  Phys. Rev. B 81, 125136 (2010)  
Systematic investigation of a family of gradient-dependent functionals for solids
http://link.aps.org/doi/10.1103/PhysRevB.81.125136

3.
Phys. Rev. B 80, 195109 (2009)  
Insight into the performance of GGA functionals for solid-state calculations
http://link.aps.org/doi/10.1103/PhysRevB.80.195109
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