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Clickstream Data Yields High-Resolution Maps of Science. by: Johan Bollen, Herbert Van de Sompel, Aric Hagberg, Luis Bettencourt, Ryan Chute, Marko A. Rodriguez, Lyudmila Balakireva. PLoS ONE, Vol. 4, No. 3. (11 March 2009), e4803. dx.doi.org/10.1371/journal.pone.0004803. https://creativecommons.org/licenses/by/2.0/