The Macromolecular Crystallographic Information File (mmCIF)
Philip E. Bourne, Helen Miriam Berman, Brian T. McMahon, Keith David Watenpaugh, John Westbrook, Paula M. D. Fitzgerald · 2001
this paper. The paper briefly covers the history of mmCIF, similarities to and differences from the PDB format, contents of the mmCIF dictionary, and how to represent structures using mmCIF. The mmCIF home page (mmCIF