Aschauer, David Alan. "Public Investment and Productivity Growth in the Group of Seven," in Federal Reserve Bank of Chicago. "September/October 1989, Volume XIII, Issue 5," Economic Perspectives (Federal Reserve Bank of Chicago) (September/October 1989) : 18-25. https://fraser.stlouisfed.org/title/5288/item/552469/toc/521896 , accessed on April 18, 2024.