5Holger. Patent Portfolios for Strategic R&D Planning. Engineering and Technology management, 1998(15)PP279-308
6Michael B. Albert. The New Innovators: Global Patenting Trends In Five Sectors,U.S. Department of Commerce Office of Technology Policy, 1998.9
7Griliches. Patent Statistics as Economic Indicators: A Survey. NBER W3301, 1990.
8Jean Lanjouw, Mark Schankermann. Research Productivity And Patent Quality: Measurement With Multiple Indicators,CEPR Discussion Paper No. EI/32,2002.P12
9Caballero, Ricardo J. and Adam B. Jaffe (1993),How High are the Giants' Shoulders: An Empirical Assessment of Knowledge Spillovers and Creative Destruction in a Model of Economic Growth, in Olivier J. Blanchard and Stanley Fischer, eds, NBER Macroeconomics Annual 1993,Cambridge: M.I.T. Press
10Koo B, Nottenburg C, Pardey P G. Plants and intellectual property: an international appraisal [ J ]. Science,2004,306 ( 19 ) : 1295 - 1297.