When you click an article's DOI link and see the error page:

"DOI Not Found"

means that the DOI is not available via CrossRef.


What you see is a preview of the DOI that may be either:

  1. The DOI has not been registered,

  2. has not been activated,

  3. incomplete


If you are author of the article and did not buy a DOI number, please contact us with the article ID number.