1. Barkhau, R., Malcolm, E. and Dimmel, D. preceding paper
2. Chemical aspects of kraft pulping
3. Marton, J. 1971.Lignins - Occurrence, Formation, Structure, and Reactions, Edited by: Sarkanen, K. and Ludwig, C. 645658–66. New York: Wiley Interscience.
4. Lignin-Carbohydrate Bonds in a Residual Lignin Isolated from Pine Kraft Pulp
5. Singh, R. 1979.The Bleaching of Pulp, 3rd ed., 15–25. Atlanta: TAPPI Press.