Thenkabail, P.S., J.W. Knox, M. Ozdogan, M.K. Gumma, R.G. Congalton, Z. Wu, C. Milesi, A. Finkral, and M. Marshall (2012), Assessing future risks to agricultural productivity, water resources and food security: how can remote sensing help?, Photogrammetric Engineering and Remote Sensing, 78, 773-782.