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2. OECD, Proposed Guidelines for Collection and Interpreting Technological Innovation Data: Oslo Manual, 1992.
3. CIS-2 Questionnaire, in: J. Fagerberg, D.C. Mowery, R.R. Nelson (Eds.), The Oxford Innovation Handbook, Oxford University Press, Oxford, 2005.
4. The Oxford Innovation Handbook;Fagerberg,2005
5. The Innovator's Dilemma;Christensen,2003