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Hi all, a found footage in Nature, 411, page 907: The web of human sexual contacts FREDRIK LILJEROS, CHRISTOFER R. EDLING, LUÍS A. NUNES AMARAL, H. EUGENE STANLEY & YVONNE ĹBERG Promiscuous individuals are the vulnerable nodes to target in safe-sex campaigns. http://www.nature.com/cgi-taf/DynaPage.taf?file=/nature/journal/v411/n6840/full/411907a0_fs.html&content_filetype=pdf (... but needs a registration first.) All the best, Christoph -- ---------------------------------------------------------- Christoph Mueller [log in to unmask] Institut fuer Soziologie http://www.soz.unibe.ch/ii/virt.html Lerchenweg 36 (Unitobler) CH-3000 Bern 9 ----------------------------------------------------------