7Banister D,J Berechman. Transport investment and economic development. USA: UCL Press,2000.33-40.
8Aschauer D. Is public expenditure productive? Journal of Monetary Economics, 1989, 23 (2) : 177 - 200.
9Munnell A. Why has productivity growth declined? Productivity and public investment. New England Economic Review, 1990,3(1) :3-22.
10Garcia-Mila T, McGuire T,Porter R. The effect of public capital in state-level production functions reconsidered. The Review of Economics and Statistics, 1996, 78(1):177-180.