All articles on are assigned a Digital Object Identifier (DOI) which is used by the CrossRef system to provide a stable URL for reference linking purposes. This allows direct links to be made to any article by using a link of the form.<DOI>

e.g. an article identified with a DOI of '10.1038/nature01234' may be linked to using the following URL:

Further information

General information on the DOI can be found at the DOI website:

Information on the CrossRef system can be found at the CrossRef website:

Please address any specific queries about use of the DOI interface to