@article{verheijen_montanarella_bastos_2012,  title={Sustainability, certification, and regulation of biochar},  volume={47},  ISSN={0100-204X},  url={https://doi.org/10.1590/S0100-204X2012000500003},  DOI={10.1590/S0100-204X2012000500003},  number={5},  journal={Pesquisa Agropecuária Brasileira},  publisher={Embrapa Secretaria de Pesquisa e Desenvolvimento; Pesquisa Agropecuária Brasileira},  author={Verheijen, Frank G. A. and Montanarella, Luca and Bastos, Ana Catarina},  year={2012},  month={May},  pages={649–653} }