Perakis, Steven, and Lars Hedin. 2002. “Addendum: Nitrogen Loss from Unpolluted South American Forests Mainly via Dissolved Organic Compounds”. Nature 418: 665–665. Referenced from www.nature.com: addendum: Nitrogen loss from unpolluted South American forests mainly via dissolved organic compounds.

Perakis, Steven, and Lars Hedin. 2007. “State Factor Relationships of Dissolved Organic Carbon and Nitrogen Losses from Unpolluted Temperate Forest Watersheds”. Journal of Geophysical Research: Biogeosciences (2005–2012) 112. Referenced from onlinelibrary.wiley.com: State factor relationships of dissolved organic carbon and nitrogen losses from unpolluted temperate forest watersheds.

Perakis, Steven, Jana Compton, and Lars Hedin. 2005. “Nitrogen Retention across a Gradient of 15N Additions to an Unpolluted Temperate Forest Soil in Chile”. Ecology 86: 96–105. Referenced from www.esajournals.org: Nitrogen retention across a gradient of 15N additions to an unpolluted temperate forest soil in Chile.

Perakis, Steven, and Lars Hedin. 2002. “Nitrogen Loss from Unpolluted South American Forests Mainly via Dissolved Organic Compounds”. Nature 415: 416–419. Referenced from www.nature.com: Nitrogen loss from unpolluted South American forests mainly via dissolved organic compounds.

Cleveland, Cory, Alan Townsend, David Schimel, Hank Fisher, Robert Howarth, Lars Hedin, Steven Perakis, et al. 1999. “Global Patterns of Terrestrial Biological Nitrogen (N2) Fixation in Natural Ecosystems”. Global Biogeochemical Cycles 13: 623. Referenced from scholarworks.umt.edu: Global patterns of terrestrial biological nitrogen (N2) fixation in natural ecosystems.

Perakis, Steven, and Lars Hedin. 2001. “Fluxes and Fates of Nitrogen in Soil of an Unpolluted Old-Growth Temperate Forest, Southern Chile”. Ecology 82: 2245–2260. Referenced from www.esajournals.org: Fluxes and fates of nitrogen in soil of an unpolluted old-growth temperate forest, southern Chile.