Xiaofeng, Bai, et al. “Properties and Applications of Biochars Derived from Different Biomass Feedstock Sources”. International Journal of Agricultural and Biological Engineering, vol. 10, no. 2, Mar. 2017, pp. 242-50, https://ijabe.migration.pkpps03.publicknowledgeproject.org/index.php/ijabe/article/view/2878.