Kammann, C., J. Ippolito, N. Hagemann, N. Borchard, M. L. Cayuela, J. M. Estavillo, T. Fuertes-Mendizabal, S. Jeffery, J. KERN, J. Novak, D. Rasse, S. Saarnio, H.-P. Schmidt, K. Spokas, and N. Wrage-Mönnig. “Biochar As a Tool to Reduce the Agricultural Greenhouse-Gas Burden – Knowns, Unknowns and Future Research Needs”. Journal of Environmental Engineering and Landscape Management, vol. 25, no. 2, Apr. 2018, pp. 114-39, doi:10.3846/16486897.2017.1319375.