Article indexing (bibliogrpahic) databases are searchable collections of journal article references. They list and describe articles from scholarly publications--primarily peer-reviewed journals, but often including conference papers or book chapters. Each database covers different publications, depending on its subject focus. Article PDFs are available when the Library has a subscription to the publication.
If you can't access an article online, search the journal title in Library Search | Ketu to see if the issue you need is in print. If you are logged in, you will be able to request a scan of an article from the Library's print journal collection.
If the article is not available at Otago, use the Library's free Interloans Service and have it delivered from another library to your desktop.