4GROSSMAN, JAY. The evolution of inhaler technotogy[J ]. Journal of Asthma, 1994, 31 (1): 55 -64.
5KUI - YIN CHEUNG, PING LIN. Spillover Effects of FDI on Innovation in China: Evidence from the Provincial Data[J] China Economic Review, 2004, ( 1 ) : 25 - 44.
6Friedman. The World City Hypothesis [ J]. Development andChang, 1986 (17).