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http://findarticles.com/p/articles/mi_hb3328/is_201011/ai_n56442890viahttp://scienceintelligence.wordpress.com/2010/12/13/social-bookmarking-tools-for-scientists-a-testVerglichen werdenCiteULike (http://www.citeulike.org),Connotea (http://www.connotea.org),BibSonomy (http://www.bibsonomy.org),and 2collab (http://www.2collab.com).