6BENGT--AKE LUNDVALL. National Systems of Inno- vation: Toward a Theory of Innovation and Interactive Learning [M]. London : Anthem Press, 2010: 45-- 46.
7JAN FAGERBERG, DAVID C. MOWERY, RICHARD R. NELSON. The Oxford handbook of innovation [M]. New York: Oxford University Press, 2006 : 209 -- 211.