"A continuous measure of gross primary production for the conterminous United States derived from MODIS and AmeriFlux data." Remote Sensing of Environment 114.576 (2010)..
"CO2 uptake and ecophysiological parameters of the grain crops of midcontinent North America: Estimates from flux tower measurements." Agriculture, Ecosystems & Environment 164 (2013) 162–175..
"Estimation of net ecosystem carbon exchange for the conterminous United States by combining MODIS and AmeriFlux data." Agricultural and Forest Meterology 148 (2008) 1827-1847..
"A model-data intercomparison of CO2 exchange across North America: Results from the North American Carbon Program site synthesis." Journal of Geophysical Research: Biogeosciences 115.G3 (2010)..