1. Is public expenditure productive?;Aschauer;Journal of Monetary Economics.,1989
2. Transportation spending and economic growth;Aschauer,1991
3. A model procedure for estimating economic impacts of alternative types of highway improvement;Babcock;Transportation Journal,1997
4. The perplexing literature on growth and change;Bartik;The Review of Regional Studies,2003
5. BEA GSP data 〈http://www.bea.doc.gov/bea/regional/gsp/〉.