Find articles that cite a given article, or that a given article cites

Articles that cite a given article

This example E-Link call returns a list of articles in PMC that cite the given article in PubMed:

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&linkname=pubmed_pmc_refs&id=21876726

This will return the numerical portion of the PMCIDs. So, for example, <Id>3930942</Id> corresponds to article PMC3930942.

You can retrieve citing articles for a set (two or more) of given articles, in one call:

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&linkname=pubmed_pmc_refs&id=21876726&id=21876761

This does the same thing, but returns PMIDs, rather than PMCIDs:

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&linkname=pubmed_pubmed_citedin&id=21876726&id=21876761

Another variation: using "pmc_pmc_citedby" lets you specify the cited article by PMCID:

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&linkname=pmc_pmc_citedby&id=3155154

Articles that a given article cites

This is the reverse of the above use-case. Given a PMCID, you can find all of the articles that it cites with an E-Link call such as the following:

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_refs_pubmed&id=4423606

The following does the same thing, but the "given article" is identified by PMID, rather than PMCID:

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pubmed&linkname=pubmed_pubmed_refs&id=24752654

The "pmc_pmc_cites" link returns only those cited articles that are in PMC:

https://eutils.ncbi.nlm.nih.gov/entrez/eutils/elink.fcgi?dbfrom=pmc&linkname=pmc_pmc_cites&id=4423606

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Last updated: Fri, 27 May 2011