1. The Industrial Efficiency Technology Database, http://ietd.iipnetwork.org/content/pulp-and-paper#key-data
2. P. Stenius , in Forest Products Chemistry, Papermaking Science and Technology 3, Fapet OY, Helsinki, Finland, 2000
3. The International Lignin Institute, http://www.ili-lignin.com/aboutlignin.php
4. Lignin as Renewable Raw Material
5. Catalytic Lignin Valorization Process for the Production of Aromatic Chemicals and Hydrogen