What is a DOI?

DOI = Document Object Identifier

A DOI identifies an individual article (like a serial number) such that a permanent URL can be created.

Most major publishers have started associating DOI's with articles and have started to show the DOI in abstracting and indexing databases (like Compendex) as well as on the article abstracts themselves.

Here's what one looks like:
10.1016/j.actaastro.2003.12.018
The first part before the / is the publisher portion of the number. This one points to Elsevier. The second part points to the journal and article specifically.

To use a DOI to create a permanent, persistent link to an article, see: Linking to Articles Online

To learn more about DOIs, see: http://www.doi.org

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