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dannyisme
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BEST ANSWER  chosen by asker   |  dannyisme  |  April 20, 2009 03:56 PM
It is here: http://www.sciencemag.org/cgi/content/abstract/321/5887/395

To quote the abstract:

Using a database of 34 million articles, their citations (1945 to 2005), and online availability (1998 to 2005), I show that as more journal issues came online, the articles referenced tended to be more recent, fewer journals and articles were cited, and more of those citations were to fewer journals and articles. The forced browsing of print archives may have stretched scientists and scholars to anchor findings deeply into past and present scholarship.
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