http://www.loc.gov/mods/v3 http://www.loc.gov/standards/mods/v3/mods-3-2.xsd
guide to the literature 1935-1976, organic and organometallic crystal structures
ed. by Olga Kennard, Frank H. Allen and David G. Watson.
"Published for the Cambridge Crystallographic Data Centre and the International Union of Crystallography."