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Bessen, James E. and Nuvolari, Alessandro, Knowledge Sharing Among Inventors: Some Historical Perspectives (2012, forthcoming). In: Dietmar Harhoff and Karim Lakhani eds., Revolutionizing Innovation: Users, Communities and Open Innovation. Cambridge: MIT Press. Pre-Print: Boston Univ. School of Law, Law and Economics Research Paper No. 11-51; LEM Working Paper 2011/21. Available at http://www.bu.edu/law/faculty/scholarship/workingpapers/documents/BessenJ-NuvolariA101411fin.pdfArchived 2013-02-28 at the Wayback Machine