You may find the Google Scholar can be useful for finding additional resources quickly. But remember this is a LIST of articles only. If you click on the link, you might not be able to get access to these articles. But do not despair!! You will more than likely get the article via ILL.
-- Use the "cited by" link a lot!! This is a list of articles that have cited the article you are interested in.
-- You can "save" the articles you find as well. Do it!