1. N. I. Klenkova, Zh. Prikl. Khim., No. 40, 2191 (1967).
2. G. Konrad and M. Schleicher, Faserf. Textilt., 24, No. 2, 82 (1973).
3. Z. A. Rogovin, The Chemistry of Cellulose [in Russian], Khimiya, Moscow (1972).
4. M. Schleicher, C. Daniels, and B. Philipp, Faserf. Textilt., 24, No. 9, 371 (1973).
5. K. Kh. Razikov, E. D. Tyagai, and Kh. U. Usmanov, Zh. Prikl. Khim., No. 5, 1183 (1976).