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A number of research articles are available in free formats from institutional repositories. To find Open Access and freely available articles, you can installl http://unpaywall.org into your browser as an extension. Unpaywall is a database of freely available research. When you go to an article on a paid site (e.g., Elsevier) unpaywall will show you a unlocked green icon in your browser window to let you know that an open version of the article exists. An open version may be a working version, one that is no longer embargoed, or one published open access.