Or for a larger view..
Bollen J, Van de Sompel H, Hagberg A, Bettencourt L, Chute R, et
al. 2009 Clickstream Data Yields High-Resolution Maps of Science. PLoS
ONE 4(3): e4803. doi:10.1371/journal.pone.0004803
http://www.plosone.org/article/fetchObjectAttachment.action;jsessionid=12DB59B270AD199B1534221AABC7C186?uri=info%3Adoi%2F10.1371%2Fjournal.pone.0004803&representation=PDF
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FRIAM Applied Complexity Group listserv
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