Verheijen, Frank G. A., Utra Mankasingh, Vit Penizek, Pietro Panzacchi, Bruno Glaser, Simon Jeffery, Ana Catarina Bastos, et al. 2017. “Representativeness of European Biochar Research: Part I – Field Experiments”. Journal of Environmental Engineering and Landscape Management 25 (2): 140-51. https://doi.org/10.3846/16486897.2017.1304943.