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Groom, Benjamin and Hepburn, C. (2007) 'Gamma Discounting and Expected Net Future Value.' Journal of Environmental Economics and Management, 53 (1). pp. 99-109.
Groom, Benjamin, Hepburn, C., Koundouri, Phoebe and Pearce, David (2005) 'Declining Discount Rates: The Long and the Short of It.' Environmental and Resource Economics, 32 (4). pp. 445-493.