Vegh, Tibor, and Brian Murray. 2020. “Incentivizing the Reduction of Pollution at U.S. Dairies: Addressing Additionality When Multiple Environmental Credit Payments Are Combined”. Journal of Agriculture, Food Systems, and Community Development 9 (2). Ithaca, NY, USA:123-39. https://doi.org/10.5304/jafscd.2020.092.010.