1. Kirsanov, V.A., Tyurin, E.T., Kirsanova, L.D., et al., Tsellyuloza, Bumaga, Karton, 2003, no. 10, pp. 46–48.
2. Chudakov, M.I., Promyshlennoe ispol’zovanie lignina (Industrial Utilization of Lignin), Moscow: Lesnaya Promyshlennost’, 1983, 3rd ed., p. 200.
3. Bogomolov, B.D., Sapotnitskii, S.A., and Sokolov, O.M., Pererabotka sul’fatnogo i sul’fitnogo shchelokov (Processing of Sulfate and Sulfite Liquors), Moscow: Lesnaya Promyshlennost’, 1989, p. 360.
4. Kirsanov, V.A. and Tyurin, E.T., Ekologiya i Promyshlennost’ Rossii, 2006, no. 8, pp. 31–41.
5. Kurkova, E.V., Cand. Sci. (Eng.) Dissertation, St. Petersburg, 1992.