1. Wilke, C. R., Ed.: Cellulose as a chemical energy resource. Biotechnol. Bioeng. Symp. No. 5, John Wiley & Sons, New York 1975, p. 361.
2. Bailey, M., Enari, T.-M., Linko, M., Eds.: Symposium on enzymatic hydrolysis of cellulose. Aulanko, Finland, 12–14 March 1975. SITRA, Helsinki 1975, p. 525.
3. Gaden, E. L., Mandels, M. H., Reese, E. T., Spano, L. A., Eds.: Enzymatic conversion of cellulosic materials: technology and applications. Biotechnol. Bioeng. Symp. No. 6, John Wiley & Sons, New York 1976, p. 319.
4. Virkola, N-E.: In Symposium on enzymatic hydrolysis of cellulose. Aulanko, Finland, 12–14 March 1975. SITRA, Helsinki 1975, p. 23.
5. Pringle, S. L.: EUCEPA International Symposium, New forest resources for the paper industry and their application. Madrid, May 6–8 1974, reprint No. 13.