Howard White's co-citation visualizations

Jim Campbell, a U-Me grad student who I hope will be joining this list soon, recommended this article to me:

Howard D. White, "Pathfinder Networks and Author Cocitation Analysis: A Remapping of Paradigmatic Information Scientists"
http://www.umit.maine.edu/~jon_ippolito/cip/white_pathfinder_networks@m.pdf

It's a bit technical, but I was interested in the social patterns revealed by measuring co-citations--i.e., when researchers cite each other. For example, lots of folks online are going to cite Lawrence Lessig, but only those researchers whom he
also cites are part of his "intellectual circle." Hence, the number of citations to a work from inside or outside a researcher's intellectual circle give a sense of their relevance locally and globally.

jon