1. Center for Energy and Climate Solutions, 1999. The internet economy and global warming. Paper Presented on the web, www.cool-companies.org.
2. David, P.A., 2000. Understanding digital technology's evolution and the path of measured productivity growth: present and future in the mirror of the past. In: Brynjolfsson, E., Kahin, B., (Eds.), Understanding the Digital Economy. MIT Press, Cambridge.
3. Delong, J.B., Summers, L.H., 2001. The ‘new economy’: background, questions and speculations. Paper Presented to FRB Kansas, August 2001.
4. Does the ‘new economy’ measure up to the great inventions of the past?;Gordon;Journal of Economic Perspectives,2000
5. A time to sow and a time to reap;Helpman,1998