1. Lignins: Occurrence, Formation, Structure, Properties, and Reactions, Ed. by K. V. Sarkanen and C. H. Ludwig (Wiley-Interscience, New York, 1971).
2. O. Faix, Holzforschung 45, 21 (1991).
3. J. Ralph, K. Lundquist, G. Brunow, F. Lu, H. Kim, P. F. Schatz, J. M. Marita, R. D. Hatfield, S. A. Ralph, J. H. Christensen, and W. Boerjan, Phytochem. Rev. 3, 29 (2004).
4. G. M. Pavlov, N. A. Mikhailova, V. Yu. Belyaev, and V. N. Syutkin, Zh. Prikl. Khim. 68, 316 (1995).
5. N. I. Afanasjev, A. V. Fesenko, A. P. Vishnyakova, and A. N. Chainikov, Polym. Sie., Ser. A 50, 190 (2008).