5Munneli, A,"Is There a Sflortfall in Public Capital Investment. [J]. Proceedings of a Conference,Series 34, Federal Reserve Bank of Boston,1993.
6Holtz--Eakin D, "Public Sector Capital and the Productivity Puzzle" [J]. NBER Working Paper , No4122,1992.
7Evans and Karras"Measuring the Contribution of Public Infrastructure Capital in Sweden", NBER Working Pa- per 3842,1991.
8Munnell, Costa, Ellson, Canning and David, "The Contributions of Infrastructure to Aggregate Output", http://www, world-- bank, org, 2000.
9Canning Kessides,"The Contributions of Infrastructure to Economic Development--A Review of Experience and Policy Implications", World Bank Discussion Papers 213,1993.
10Eberts R W, "Highway Infrastructure:Policy Issues for Regions", W, E, Upjohn Institue for Employment Re- search ,Jan, 1997.
