Hourcade, J.C., Richels, R., Robinson, J.R., & Schrattenholzer, L. (1996). Estimating the costs of mitigating greenhouse gases. In: Climate Change 1995: Economic and Social Dimensions of Climate Change. Eds. Bruce, J.P., Lee, H., & Haites, E.F., Cambridge: Cambridge University Press. ISBN 0-521-56431-X