Rabotyagov, S., T. Campbell, M.K. Jha, P.W. Gassman, J.G. Arnold, L. Kurkalova, S. Secchi, H. Feng and C.L. Kling. 2010. Least cost control of agricultural nutrient contributions to the Gulf of Mexico Hypoxic Zone. Ecological Applications 20(6):1542-1555. DOI: 10.1890/08-0680.