If you have the DOI, go to https://libkey.io to enter the DOI and be directed to the PDF!
You can look up an item from its DOI by entering the DOI onto the library's Article Lookup by Citation page. This video demonstrates the process:
What is a DOI?
A digital object identifier (DOI) is a unique number to an online document, like an ISBN is for a book. You can usually find the DOI on the article itself. You can also find a DOI by:
Search for your article on Google or Google Scholar and check the publisher’s page.