Citation chaining (or chasing) is the name for a process in which you use an information source to find other work that is cited within the first source (backwards chaining) or cites to the first source (forward chaining).
Below is a YouTube video on how citation chaining works in Google Scholar. Keep in mind that you should never have to pay for an article while you are at UO Libraries. Contact your Subject Librarian for help locating materials. In this video, look for a "fluff word" that the researcher uses when searching.