In addition to Lexis and Westlaw, you can use some of the databases listed on the Library Databases tab to find articles or use the Discovery Service. Keep in mind that, generally, Lexis and Westlaw, go back to the mid-1980s at best, and, if you are researching an historical topic, you may want to use HeinOnline or some of the other resources.
Links go to the open access law review site, if one is available. These are available on Lexis, Westlaw, and HeinOnline as well.