6HUANGZan, CHEN Hsinchun, YIP A, et al. Longi tudinal patent analysis for nanoscale science and engi neering: country, institution and technology field [J].Journal of Nanoparticle Research, 2003, 5 (3) : 333 - 363.
8SINGH J. Social networks as drivers of knowledge dif- fusion [EB/OL]. (2003-10-22) [-2011-12-07]. http:// papers, ssrn. com/sol3/papers, cfm? abstract_ id = 431872.
9MORGAN T H. The theory of the gene [M]. New Ha- ven: Yale University Press, 1926.
10DAWKINS R. The Selfish Gene [M] . London: Oxford University Press, 1976.
