In both our catalog and our databases, look at the links for the subject terms. Here's an example from our catalog.
In addition to strict subject linking, some of our databases have functions relying on keywords and relevancy ranking that may provide useful results. When you've found a good article, look around the edges of the page for things like "Find Similar Results" or "See similar documents." The results are only as good as their relevancy ranking, so what you get may or may not be on target for your interests, and not every database has this feature. But it could do some of the heavy lifting for you in rounding up research materials.