1. The process of creative construction: knowledge spillovers, entrepreneurship, and economic growth;Agarwal;Strategic Entrepreneurship Journal,2007
2. Multiple Regression: Testing and Interpreting Interactions;Aiken,1991
3. Is public expenditure productive?;Aschauer;J. Monetary Econ.,1989
4. Transport Investment and Economic Development, E&FN Spon;Banister,2000
5. The Role of Infrastructure in Regional Development;Biehl,1991