"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..
"CO2, CO, and CH4 measurements from tall towers in the NOAA Earth System Research Laboratory's Global Greenhouse Gas Reference Network." Atmospheric Measurement Techniques 7 (2014) 647-687..
"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)..