EZproxy links are found on the Library Webpage, WorldCat and Research guides. They can be recognized because they all start with "https://aus.idm.oclc.org/login?url=". When using one of these links for the first time in a browsing session, you'll probably be prompted for your AUS username and credentials, via an AUS login box:
You shouldn't be prompted to login again if you use another proxied link off one of the AUS Library websites.
See: https://library.aus.edu/linkingresource for more details about how proxy URL's work.