1. Compression Wood in Gymnosperms
2. Ladel, J. L., Carmichael, A. J. and Thomas, G. S. 1967.Proceedings of the 8th Lake States Forest Tree Improvement Conference, September 12–13 52–60.
3. Dioxin sources and mechanisms during pulp bleaching
4. CPPA Standard Methods. 1992. Method # G.8, G.9, and G.13