Helen M. Berman Kim Henrick Haruki Nakamura John L. Markley The worldwide Protein Data Bank (wwPDB): ensuring a single, uniform archive of PDB data. 301-303 2007 35 Nucleic Acids Research Database-Issue http://dx.doi.org/10.1093/nar/gkl971 db/journals/nar/nar35.html#BermanHNM07