Where do the listed citations come from?

From the open OpenCitations database (COCI index), complemented with titles from the Crossref API.

Is the citation count complete?

Not necessarily. Only citations with open references registered with Crossref are counted; citations in works without deposited references do not appear.

Why does the number differ from Google Scholar?

Google Scholar crawls the web and includes unregistered documents; open databases count only formally deposited citations. Scholar numbers are usually higher.

Look Up Citations to a DOI — Crossref GD Toolkit

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Enter a DOI number to look up citations made to it:

Frequently asked questions

Where do the listed citations come from?
From the open OpenCitations database (COCI index), complemented with titles from the Crossref API.
Is the citation count complete?
Not necessarily. Only citations with open references registered with Crossref are counted; citations in works without deposited references do not appear.
Why does the number differ from Google Scholar?
Google Scholar crawls the web and includes unregistered documents; open databases count only formally deposited citations. Scholar numbers are usually higher.