1. L. Hough and J. K. N. Jones in “Methods in Carbohydrate Chemistry,” Vol. 1, ed. by R. L. Whistler and M. L. Wolfrom, Academic Press, New York, 1962, pp. 21–23.
2. I. Smith, in “Chromatographic and Electrophoretic Techniques,” Vol. 1, ed. by I. Smith, William Heinemann Medical Books, London and Interscience Publishers, New York, 1960, pp. 246–260.
3. A. Fuchs, On the Synthesis and Breakdown of Levan by Bacteria, Ph.D. Thesis, University of Leiden, The Netherlands, 1959, pp. 120—144.