What is a DOI?
DOI numbers (Digital Object Identifiers) are unique number combinations assigned to an article. With the help of this DOI number the article can always be located.
The numbers consist of
- numbers assigned to the publisher (in the example used below these are 10.1016)
- the journal title (j.fertnstert or the Journal of Fertility and Sterility)
- some numbers that define the actual article
- In recent articles, especially articles that have been published in an Elsevier journal, the DOI number is given at the beginning of the article.
For example, you can find: doi:10.1016/j.fertnstert.2004.08.029.
- When there is no DOI number in the article, you can check whether a DOI number exists for the article on the Crossref website. A search query on this site gives you the DOI and a persistent link; in this case this is dx.doi.org/10.1016/j.fertnstert.2004.08.029 .
- If this last option does not give you any results, you can copy the address (the URL) of the article from the address bar.