1. Almond, D., & Mazumder, B. (2006). How did schooling laws improve long-term health and lower mortality? Federal Reserve Bank of Chicago working paper no WP-06-23. http://www.chicagofed.org/publications/workingpapers/wp2006_23.pdf .
2. Bahk B.-H., Gort M. (1993) Decomposing learning by doing in new plants. Journal of Political Economy 101: 561–583
3. Bils, M. (2004). Measuring the growth from better and better goods. NBER working paper no. 10606, July. http://www.nber.org/papers/w10606 .
4. Bresnahan T. F., Gordon R. J. (1996) The economics of new goods. University of Chicago Press, Chicago
5. Duggan, M. G., & Evans, W. N. (2008). Estimating the impact of medical innovation: A case Study of HIV antiretroviral treatments. Forum for Health Economics & Policy, 11(2). Economics of the HIV Epidemic, Article 1. http://www.bepress.com/fhep/11/2/1 .