Nitrogen

Sudderth, Erika A, Samuel B St. Clair, Sarah A Placella, Stéphanie M Swarbreck, Cristina Castanha, Donald J Herman, Marc L Fischer, Markus Kleber, Erik B Sudderth, Margaret S Torn, Mary K Firestone, Gary L Andersen, and David D Ackerly. "Annual grassland resource pools and fluxes: sensitivity to precipitation and dry periods on two contrasting soils." Ecosphere 3.8 (2012).

Singer, Brett C, Michael G Apte, Douglas R Black, Toshifumi Hotchi, Donald Lucas, Melissa M Lunden, Anna G Mirer, Michael Spears, and Douglas P Sullivan. Natural Gas Variability in California: Environmental Impacts and Device Performance - Experimental Evaluation of Pollutant Emissions from Residential Appliances. Berkeley: Lawrence Berkeley National Laboratory, 2009.