Use of Doi

 USE OF THE DIGITAL OBJECT IDENTIFIER (DOI)

The Digital Object Identifier (DOI) may be used to cite and link to electronic documents. The DOI consists of a unique alphanumeric character string assigned to a document by the publisher upon the initial electronic publication. The assigned DOI never changes, i.e., when the authors use a DOI to create links to documents on the web, the DOIs are guaranteed never to change