Once you've searched an index to find articles, you may need to use Get it at UC to link to a PDF or html file if the full text is not immediately available. Each database is a bit different, but a good rule of thumb is:
Start your search here to find books, articles and more from the Law Library and a selection of law and related fields.
BerkeleyLaw Search Books and Articles
If an article is relevant to your topic, you want to look at the research it cited (backward citation). But it can also be very helpful to see who has cited it (forward citation). There are several different ways to do this, and the results will overlap -- no single method is comprehensive.
Google Scholar provides forward citations for some articles. It has a broader range of documents included (not just peer reviewed journals, but reports, pre-prints, etc.) and doesn't eliminate self citation or de-duplicate the results.
ISI Web of Science contains the Social Science Citation Index which allows you to do a "Cited Reference" search. This shows other articles (from a prestigious list of peer reviewed journals) which have cited the target article, and it also shows the references for the the original article... both forward and backward citation.
Screenshot below on how to get to the Cited Reference Search from the Social Science Citation Index.