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Poffenbarger, Hanna J., Daniel W. Barker, Matthew J. Helmers, Fernando E. Miguez, Daniel C. Olk, John E. Sawyer, Johan Six, and Michael J. Castellano. "Maximum Soil Organic Carbon Storage in Midwest U.S. Cropping Systems When Crops Are Optimally Nitrogen-fertilized." PLoS One 2017.

Poffenbarger, Hanna J., et al. "Maximum Soil Organic Carbon Storage in Midwest U.S. Cropping Systems When Crops Are Optimally Nitrogen-fertilized." PLoS One 2017.