A literature review is:
The purpose of a literature review, therefore, is:
If you find a seed article, or any other really good article, we have a magic database, called Scopus, which can find all the other articles which have cited that article, either because they support it or because they disagree with it.
Scopus is on our database list under Scopus. Click here to access it directly. In the search results page, you will see a "Cited by" column. If you can't find the full text immediately, you can often get the full text of the articles off one or other of our alternative databases.
You try the same strategy on Academic Search Complete. Click on the "Cited References" link at the top of the page.
Google Scholar does something similar. Find your article of interest, and click on the "Cited by" link.