Cowei, Annete L., Adriana E. Downie, Brendan H. George, Bhupinder‑Pal Singh, Lukas Van Zwieten, e Deborah O’Connell. 2012. “Is Sustainability Certification for Biochar the Answer to Environmental Risks?”. Pesquisa Agropecuária Brasileira 47 (5):637-48. https://doi.org/10.1590/S1678-3921.pab2012.v47.12888.