1. Sanada Y, Suzuki M, Fujimoto K (1992) In: Activated carbon. Kodansha, Tokyo, pp 54–65, 230–238
2. Goring DAI (1963) Thermal softening of lignin, hemicellulose and cellulose. Pulp Pap Mag Can 64:T517–527
3. Mikami M, Kamada M (1964) Preparation of active carbon. I. Granulation and carbonization of lignin and sawdust-char. Rep Hokkaido Ind Res Inst 169:1–7
4. Mikami M, Kamada M (1964) Preparation of active carbon. II. Steam activation of lignin. Rep Hokkaido Ind Res Inst 169:8–13
5. Uraki Y, Kubo S, Nigo N, Sano Y, Sasaya T (1995) Preparation of carbon fibers from organosolv lignin obtained by aqueous acetic acid pulping. Holzforschung 49:343–350