Kettunen, Riitta, and Sanna Saarnio. “Biochar Can Restrict N2O Emissions and the Risk of Nitrogen Leaching from an Agricultural Soil During the Freeze-Thaw Period”. Agricultural and Food Science 22, no. 4 (December 18, 2013): 373–379. Accessed April 20, 2024. https://journal.fi/afs/article/view/7887.