6Katharine Wakelin.Productivity growth and R&D expenditure in UK manufacturing firms[J].Research Policy,2001,(30):1079.
7Dominique Guellec,Van Pottelsberghe De La Potterie.From R&D to productivity growth:do the institutional settings and the source of funds of R&D matter?[J].Oxford Bulletin of Economics & Statistics,2004,(66):353.
8Danison E F.Why growth rates differ:post-war experience in nine western countries[J].Washington Brookings Institution,1967.
9Solow,Robort M.Technical:change and aggregate production[J].Review of Economics and Statistics,1956,(37).