PubMed has a built-in discovery tool called Similar Articles (formerly labeled Related Citations). This feature appears below each reference on a list of results as well as on the abstract view page for a reference. The name was changed to make this feature clearer to users. It’s a useful tool to be aware of, especially for those tough searches that don’t yield a sufficient number of results. See the screenshots below for examples of what you can expect to see in PubMed.
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Results page view

Abstract page view