4Aschauer, David A, 1989. "Is Public Expenditure Productive?" Journal of Monetary Economics. 23 (2).
5Finn, Mary, 1993. "Is All Government Capital Productive?" Federal Reserve Bank of Richmond Economic Quarterly. 79 (4).
6Haque, M. E. , and D. H. Kim, 2003. "Public Investment in Transportation and Communication and Growth: A Dynamic Panel Approach. "University of Manchester CGBCR Discussion Paper. No 031.
7Munnell, Alicia H., 1990. "Why Has Productivity Growth Declined? Productivity and Public Invest- ment. "New England Economic Review (Jan/Fed).