Citation Chaining
Citation chaining is a process through which you can identify useful and relevant sources by inspecting which sources have cited each other. In this way, you can explore a discussion, topic, or idea both forward and backward across time.
Forward Chaining (and Google Scholar)
If you need sources newer than the one you've already found, try forward chaining.
Backward Chaining
To find sources that your article has cited (backward chaining), you can look through its References or Works Cited. These sources will be older than the article citing them.