Articles on the PAW formalism

The original article introducing the PAW formalism:
P. E. Blöchl
Physical Review B, Vol. 50, 17953, 1994
A different formulation of PAW by Kresse and Joubert designed to make the transition from USPP to PAW easy.
G. Kresse and D. Joubert
Physical Review B, Vol. 59, 1758, 1999
A second, more pedagogical, article on PAW by Blöchl and co-workers.
P. E. Blöchl, C. J. Först, and J. Schimpl
Bulletin of Materials Science, Vol. 26, 33, 2003