VASP methodology paper I
Efficiency of ab-initio total energy calculations for metals and semiconductors using a plane-wave basis set. G. Kresse, J. Furthmüller
Computational Materials Science, Volume 6, Issue 1, July 1996, Pages 15-50
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PAW paper I
Projector augmented-wave method P. E. Blöchl
Phys. Rev. B 50, 17953–17979 (1994)