American Mathematical Society's Mathematical Reviews, covering over 1,800 journals. Also includes citations to articles dating back to the early 1800s.
The link above leads to the Ebsco interface, but you can also use the American Mathematical Society version of MathSciNet. See the Quickstart Guide for more details about the AMS version.
Are you affiliated with multiple CUNY campuses? For example, do you study at the GC but work at another campus, or maybe even two other campuses? If so, you are entitled to remote access to library e-resources (e.g., databases, e-journals, e-books) from all of your affiliated campuses. Different CUNY libraries have different e-resources, so check all of your affiliated libraries (via their separate websites) for the e-resources you need!

Google Scholar provides a simple way to search broadly for scholarly literature, including journal articles and books. The Graduate Center Library has created a customized version that knows the library’s electronic journal holdings and links you directly to the articles in the library’s databases.
Go to GC-customized Google Scholar
Note: If you’re off campus, you’ll be prompted to log in with your GC credentials before you can access library subscriptions.
It’s common to hear questions about the importance of an article, the quality of a journal, the prominence of a researcher, etc. Answering these questions requires a nuanced understanding of the topic/field in question, but there are attempts to answer them numerically, with "research metrics."
It's is important to understand how these metrics are calculated, what exactly they do and do not say, and when and how to look beyond them. Learn about:
Icon credit: metrics by Danang endar from Noun Project (CC BY 3.0)