What is a DOI?
A Digital Object Identifier (DOI) is assigned to electronic journal articles (and selected other online content) to specifically and permanently identify and access that article. Many standard academic citation formats now require the inclusion of DOIs within a citation when available.
All DOI numbers begin with a 10 and contain a prefix and a suffix separated by a slash. The prefix is a unique number assigned to organizations; the suffix is assigned by the the organization. Some articles, especially older articles, won't have a DOI.
