1Zoltan J Acs, Luc Anselin, Attila Varga. Patents and innovation counts as measures of regional production of new knowledge [J]. Research Policy,2002(31) : 1069 - 1085.
2Wesley M. Cohen, Akira Goto, Aldya Nagata, Richard R. Nelson, John P. Walsh. R&D spillovers, patents and the incentives to innovate in Japan and the United States[J ]. Research Policy, 2002(31) :1349 - 1367.
3Mourad Ossalah. Some notes on fusion of uncertainty information[J]. International Journal of Intelligent Systems, 2004,19 (6) :457 - 471.