D. J. Lewis, Plantinga, A. J., Nelson, E., and Polasky, S.,
“The Efficiency of Voluntary Incentive Policies for Preventing Biodiversity Loss”,
Resource and Energy Economics, vol. 33, no. 1, pp. 192-211, 2011.
D. J. Lewis, Barham, B. L., and Robinson, B.,
“Are there Spatial Spillovers in the Adoption of Clean Technology? The Case of Organic Dairy Farming”,
Land Economics, vol. 87, no. 2, pp. 250-267, 2011.