Metadata for Zotero

Hello Zotero users and experts,

I was wondering where is Zotero's source of parent metadata?

Thank you,
  • In most instances it comes from CrossRef (DOIs) or various library catalogs (ISBNs).
    As a fallback, Zotero extracts basic metadata from the PDF text and I believe matches that against internal data -- those results are much less good; the exact code for that is no longer online. The source of metadata used is listed under "Library Catalog" in the metadata entry.

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