1. G. O. Aspinall, “Advan. in Carbohydrate Chem.” Vol. 14, Academic Press Inc., New York, N.Y., 1959, p. 429.
2. R.L. Whistler,“ Advan. in Carbohydrate Chem.” Vol. 5, Academic Press Inc., New York, N. Y., 1950, p. 269.
3. T. E. Timell, “Advan. in Carbohydrate Chem.” Vol. 19, Academic Press Inc., New York, N. Y., 1964, p. 247;ibid., Vol. 20, 1965, p. 409.
4. F. D. Snell and T. C. Snell, “Colorimetric Method of Analysis,” Vol. II, Van Nostrand, New York, 1959, p. 691.
5. “Method in Carbohydrate Chem.“ Vol. I, ed. by R. L. Whistler and M. L. Wolfrom, Academic Press, New York and London, 1962, p. 383.