How can I find the DOI number (digital object identifier) for a reference I'm citing in my paper?

Question

A free DOI lookup tool is available from CrossRef, linked below.

Alternately, if you need the DOI of a journal article that's indexed in PubMed, try using PubMed to find the needed number:

Find the PubMed record for the article (PubMed's single citation matcher may be helpful).
The DOI is visible in the summary and abstract views

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