"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)..
"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)..
"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..