Mapping between zbMATH Open identifiers, DOIs and ORCIDs

Initial version of the mapping between zbMATH Open identifiers for authors and documents and DOIs as well as ORCIDs in CSV format. The file authors.csv contains the mapping between zbMATH Open author id and ORCIDs for currently 35 016 authors. The file documents.csv contains the mapping between zbMATH Open document id and DOI for currently 2 616 582 documents.