You can find an article by searching with the DOI in Google Scholar. Google Scholar will provide you with a citation of the article, then you can search for the article u sing the library catalogue.
The DOI may be found in some of the following places:
Not all articles have a DOI number. If your article does not have a DOI number, use the URL of the journal's homepage (not the database retrieval site).
Note the correct format for the DOI number: doi:xxxxxxxx (lowercase letters, no space following the colon, no period afterwards).
If you have a DOI number, you do not need a URL or other retrieval locations for your URL.