4Meah K, Ula S, Barrett S. So- lar Photovoltaic Water Pum- ping-opportunities and Chal- lenges [ J ] Renewable and Sustainable Energy Reviews, 2008,12 : 1162-1175.
5Kenneth K L ,Jared T M. Configuration Optimization of a Photo- voltaic Power Plant in Relation to Cost and Performance ,[ C ]. Proceedings of the ASME 2010 4th International Conference on Energy Sustainability, May 17 - 22, 2010, Phoenix, Arizona, USA.
6Stemitzke C, Bartkowski A, Schramm R. Visualizing Patent Sta- tistics by Means of Social Network Analysis Tools[ J]. World Pa- tent Information,2008,30(2) :115-131.
7Ernst H. Patent Information for Strategic Technology Manage- ment [ J ]. World Patent Information,2003,25 ( 3 ) : 233-242.
8Lanjouw J O, Schankerman M. The Quality of Ideas: Measuring Innovation with Multiple Indicators [ EB/OL ]. [ 2012 - 04 - 01 ]. http://www, nber. org/paper/w7345.
9Yoon B, Yoon C, Park Y. On the Development and Application of a Self-organizing Feature Map - based Patent Map[ J]. R &D Management,2002,32(4) :291-300.
