The Protein Data Bank: unifying the archive.
John D. WestbrookZukang FengShri JainT. N. BhatNarmada ThankiVeerasamy RavichandranGary GillilandWolfgang BluhmHelge WeissigDouglas S. GreerPhilip E. BourneHelen M. BermanPublished in: Nucleic Acids Res. (2002)