The PDB data uniformity project. - T. N. Bhat; Philip E. Bourne; Zukang Feng; Gary Gilliland; Shri Jain; Veerasamy Ravichandran; Bohdan Schneider; Kata Schneider; Narmada Thanki; Helge Weissig; John D. Westbrook; Helen M. Berman (Nucleic Acids Res., 2001)