Biederman, L. A. (2012-12-31). "Biochar and its effects on plant productivity and nutrient cycling: a meta-analysis". GCB Bioenergy. 5 (2): 202–214. doi:10.1111/gcbb.12037. S2CID86216355.
Biederman, L. A. (2012-12-31). "Biochar and its effects on plant productivity and nutrient cycling: a meta-analysis". GCB Bioenergy. 5 (2): 202–214. doi:10.1111/gcbb.12037. S2CID86216355.