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***** To join INSNA, visit http://www.sfu.ca/~insna/ ***** I've heard that Simon published a scale-free model 45 years ago when he was studying firm sizes, but I haven't read the paper. It's: Herbert Simon (1955) “On a class of skew distribution functions,” Biometrika, 42:425-440. Does anyone by chance have a softcopy? Doug Bryan [log in to unmask] http://pavg.stanford.edu/people/bryan _____________________________________________________________________ SOCNET is a service of INSNA, the professional association for social network researchers (http://www.sfu.ca/~insna/). To unsubscribe, send an email message to [log in to unmask] containing the line UNSUBSCRIBE SOCNET in the body of the message.