J. Bradford DeLong (1988), "Productivity Growth, Convergence, and Welfare"
J. Bradford DeLong (1989), "Nassau Senior's `Last Hour' and the `Advances' Conception of Capital Revisited," History of Political Economy 21: 2 (Summer), pp. 309-310.

J. Bradford DeLong and Lawrence H. Summers, "On the Existence and Interpretation of a `Unit Root' in U.S. Real GDP" (Cambridge, MA: Harvard University Department of Economics, 1989).

J. Bradford DeLong and Lawrence H. Summers, "On the Existence and Interpretation of a `Unit Root' in U.S. Real GDP" (Cambridge, MA: Harvard University Department of Economics, 1989).

http://www.j-bradford-delong.net/pdf_files/Unit_Root.pdf

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