1. Yarsley, V. E., Chem. and Ind., 7 (1967) 250.
2. Flory, P. J., Principles of Polymer Chemistry, Cornell University Press, Ithaca, New York, 1953, p. 9.
3. Saenger, W., Angew. Chem. Int. Ed. Eng., 19 (1980) 344; Dell, A., Oates, J., Lugowski, C., Romanowska, E., Kenne, L. and Lindberg, B., Carbohydrate Res., 133 (1984) 95.
4. Bevington, J. C, Melville, H. W. and Taylor, R. P., J. Polym. Sci., 12 (1954) 449; 14 (1954) 463.
5. Kelen, T., Schlotterbeck, D. and Jaacks, V., IUPAC Conference on Macromolecules, Boston, 1971.