1. Hydrocarbon Proc. 1996;Nov:11.
2. Chem. Eng. News. 1996;Dec(9):22.
3. The use of steam and CO2 as activating agents in the preparation of activated carbons
4. Biomass for energy and industry;Porquet;CARMEN,1998
5. Quinn DF, Holland JA. Carbonaceous material with high micropore and low macropore volume and process for producing same. US Patent 5 071 820, 1991.