6BLANK D M,STIGLER G J. The demand and supply of scientific personnel[ J:. The Review of Economic and Statistics, 1958,40 (2) :188 -191.
7PATANAKUL P, PINTO J K. Examining the roles of government policy on innovation [ J ]. The Journal of High Technology Management Research, 2014,25(2) :97 - 107.
8ARROW K J. The economic implications of learning by doing[ JJ. The Review of Economic Studies, 1962,29 (3) :155 - 173.
9KLASSEN K J, PITI'MAN J A, REED M P. A cross-national comparison of R&D expenditure decisions : tax incentives and financial constraints [ J ]. Contemporary Accounting Research,2004,21 (3) :639 - 680.