1. Sohi, S.Loez-Capel, E., Krull, E., Bol, R.,. Biochar’s roles in soil and climate change: A review of research needs. CSIRO Land and Water Science Report 05/09, 64 pp. [2009]
2. Global Industry Analysis, Inc., Global Activated Market to Reach 2.3 Million Metric Tones by 2017, According to New Report by Global Industry Analysts, Inc.http://www.prweb.com/releases/activated_carbon/water_treatment/prweb8286149.htm
3. Oladayo A, Proximate composition of some agricultural wastes in Nigeria and their potential use in activated carbon production. J Appl Sci Environ. Manag. 14: 55–58 (2010).
4. Statista 2017: World cocoa production by country from 2012/2013 to 2016/2017 (in 1,000 metric tons) https://www.statista.com/statistics/263855/cocoa-bean-production-worldwide-by-region/
5. H. Deng, G. Li, H. Yang and J. Tang, Chem Eng J, 163, 373–381 (2010).