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Also includes a coverage object indicating which sources contributed data and whether any source failed temporarily.","failureModes":["Unknown or invalid ID returns a note field indicating no source matched, with empty fields","Semantic Scholar TLDR may be empty if the paper is not indexed there","PDF URL is null if the paper is not truly open access","Temporary source failure sets coverage.retry=true, indicating partial data","Malformed DOI or arXiv ID format returns an error or empty result"],"whenToPreferThis":"Use this endpoint when you already know the paper identifier (DOI, arXiv ID, or PMID) and need rich, merged metadata from multiple authoritative databases in one call — especially when you need citation-ready BibTeX/APA, retraction checks, or open-access PDF links. Prefer this over general web search when precision, citation formatting, and multi-source aggregation matter. 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