Crossref

Check DOI, publication, and citation metadata.

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What it does

Crossref DOI records identify publications and their citation metadata.

When to use it

Validate authors, titles, and publication details by DOI in a bibliography.

BnF Data

Explore BnF data models and semantic connections.

  • books
  • metadata

Research

MusicBrainz

Find relationships among musical works, recordings, and releases.

  • music
  • metadata

Research

CORE

Search open access papers and repository content.

  • scholarship
  • open-access

Research