#bibliometrics

Scholarly citations as open data — powered by OpenCitations (COCI), the open citation index. Unlike a metadata lookup, OpenCitations treats every citation as a first-class object: given a DOI you can list the papers that cite it (incoming citations) and the papers it references (outgoing), each annotated with its OpenCitations Identifier (OCI), the date the citation was created, the timespan between the two works, and whether it is a journal- or author-self-citation. Plus quick citation and reference counts for any DOI. It is built for citation-network and bibliometric work — research-impact analysis, self-citation detection, citation-timespan studies and science mapping — and is distinct from scholarly-metadata services (Crossref, OpenAlex). From a single paper to a whole reference graph, ideal for bibliometrics, research-analytics and reference-management tools. Open data from OpenCitations (CC0).

api.oanor.com/opencitations-api

Europe PMC as an API, powered by EMBL-EBI — an open repository of biomedical and life-sciences literature covering 45 million+ abstracts and 9 million+ full-text articles drawn from PubMed, PubMed Central, preprint servers (bioRxiv and medRxiv), patents and Agricola. Search the literature with rich field syntax (by author, title, journal, MeSH term, publication year or open-access status), ordering results by relevance, date or citation count, and optionally restricting to preprints only; read an article's full metadata and abstract — its authors, journal, volume and pages, DOI, PubMed and PMC identifiers, MeSH terms, keywords, funding grants and links to the free full text; and walk the citation network in both directions: the articles that cite a given paper, and the works that paper itself references. Together these let you measure scholarly impact, build citation graphs, track a research topic across preprints and peer-reviewed papers, and feed evidence into bibliometric, systematic-review and research-intelligence tools. Article identifiers are PubMed ids (numeric), PMC ids (PMC…) or preprint ids (PPR…); the source defaults to PubMed (MED). Data from EMBL-EBI Europe PMC.

api.oanor.com/europepmc-api

Open scholarly analytics as an API, powered by OpenAlex — the open index of the world\x27s research covering over 250 million works and 90 million authors. Look up researcher profiles with their total works, citation counts, h-index, i10-index and current affiliation, fetch any author by OpenAlex id or ORCID, rank institutions (universities and labs) by research output and citations, search hundreds of millions of scholarly works complete with citation counts, open-access status, venue and author lists (sortable by citations or date), and explore the full topic taxonomy of science by domain, field and subfield. Perfect for research-intelligence and bibliometrics tools, university and grant dashboards, literature-discovery apps, science maps and citation analysis. All data is CC0 and live. No accounts, no upstream key. For DOI metadata use the Crossref API and for preprints the arXiv API.

api.oanor.com/openalex-api