RESEARCH IMPACT OF PAYWALLED VERSUS OPEN ACCESS PAPERS
This research presents data from the 1science oaIndx on the average of relative citations (ARC) for 3.3 million papers published from 2007 to 2009 and indexed in the Web of Science (WoS). These data show a decidedly large citation advantage for open access (OA) papers, despite them suffering from a lag in availability compared to paywalled papers.
The full article is available from the 1Science site (http://www.1science.com/oanumbr.html):
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