Verheijen, F. G. A., U. Mankasingh, V. Penizek, P. Panzacchi, B. Glaser, S. Jeffery, A. C. Bastos, P. Tammeorg, J. Kern, C. Zavalloni, G. Zanchettin, and R. Sakrabani. “Representativeness of European Biochar Research: Part I – Field Experiments”. Journal of Environmental Engineering and Landscape Management, vol. 25, no. 2, June 2017, pp. 140-51, doi:10.3846/16486897.2017.1304943.