The Library subscribes to hundreds of databases. Consult the A-Z Databases list to see them. Search for or browse online resources by subject (broad academic disciplines) or by database type (article databases, book and film reviews, statistics and numeric data, etc.)
If an article is relevant to your topic, it can be very helpful to see who has cited it. There are several different ways to do this, and the results will overlap -- no single method is comprehensive.