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http://www.cscs.ch/projects/CP2K.html or http://cp2k.berlios.de
http://www.fysik.dtu.dk/CAMP/CAMPOS_welcome.html
http://cst-www.nrl.navy.mil/people/singh/planewave
http://www.cineca.it/∼acvO/CP/carpar.html
http://www.wfu.edu/∼natalie/papers/pwpaw/man.html
http://www.fhi-berlin.mpg.de/th/fhimd
http://cms.mpi.univie.ac.at/vasp
http://www.tcm.phy.cam.ac.uk/castep
http://www.pt.tu-clausthal.de/∼ptpb/PAW/pawmain.html
http://www.nersc.gov/projects/paratec
http://www.gnu.org/copyleft/gpl.txt
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http://bohr.inesc.pt/jlm/pseudo.html
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http://www.cscs.ch/molekel
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F. Jollet, M. Torrent, G. Zerah, X. Gonze, unpublished
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http://www.literateprogramming.com/ and the links therein
http://www.xs4all.nl/∼rfsber/Robo/robodoc.html
http://www.eng.gunma-u.ac.jp/∼amano, version 2.13j
Though the src2tex software has to be slightly modified
http://hutchinson.belmont.ma.us/tth/ TtH is useful to make HTML documents with mathematical equations without relying on any picture files
http://www.sourceforge.net
Nunes, 2001, Phys. Rev. B, 63, 115118, 10.1103/PhysRevB.63.155107
King-Smith, 1991, Phys. Rev. B, 44, 13063, 10.1103/PhysRevB.44.13063
http://www.tuxedo.org/∼esr/writings/cathedral-bazaar/