Verheijen, F. G. A.; Mankasingh, U.; Penizek, V.; Panzacchi, P.; Glaser, B.; Jeffery, S.; Bastos, A. C.; Tammeorg, P.; Kern, J.; Zavalloni, C.; Zanchettin, G.; Sakrabani, R. Representativeness of European Biochar Research: Part I – Field Experiments. JEELM 2017, 25, 140-151.