9Nordhaus William D, Robert N. Stavins, Martin L. Weitzman, Lethal Model 2. The Limits to Growth Revisited. Brookings Papers on Economic Activity, Vol. 1992, No. 2,1992, pp. 1-59.
10Solow R. M. , lntergenerational Equity and Exhaustible Resources. The Review of Economic Studies. Vol. 41,1974, pp.29-45.