2Pilkington A, Dyerson R, Tissier O. The Electric Vehicle: Pa- tent Data as Indicators of Technological Development [ J ]. World Patent Information, 2002, 24( 1 ) : 5-12.
3Ahman M. Government Policy and the Development of Electric Vehicles in Japan [ J]. Energy Policy, 2006, 34(4) : 433-443.
4Oltra V, Saint Jean M. Variety of Technological Trajectories in Low Emission Vehicles (LEVs) : a Patent Data Analysis [J ]. Journal of Cleaner Production, 2009, 17(2) :201-213.
5Glachant M, Dechezleprtre A, Hascic I, et al. Invention and Transfer of Climate Change Mitigation Technologies on a Global Scale: A Study Drawing on Patent Data [ Z]. Fondazione Eni Enrico Mattei Working Papers, 2009, 343 : 1-49.
6Haslam G E, Jupesta J, Parayil G. Assessing Fuel Cell Vehicle Innovation and the Role of Polic y in Japan, Korea, and China [J]. International Journal of Hydrogen Energy, 2012 ( 37 ) : 14612-14623.
7JAMA. Active Matrix Database System [ DB/OL ]. [ 2013 - 12- 29 ]. http ://jamaserv. jama. or. jp/newdb/ang/index, html.
8Frenken K, Hekkert M, Godfroij P. R & D Portfolios in Envi- ronmentally Friendly Automotive Propulsion: Variety, Competi- tion and Policy Implications [ J ]. Technological Forecasting and Social Change, 2004, 71 (5): 485-507.
9Frietsch R, Schmoch U. Transnational Patents and International Markets[J]. Scientometrics, 2010, 82(1) : 185-200.
10Schmoch U. Patent Analyses in the Changed Legal Regime of the US Patent Law Since 2001 [ J ]. World Patent Information. 2009, 31(4) :299-303.
