1. See, for example, W. Brown, “Cellulose Derivatives,” N. M. Bikales and L. Segal, Ed., Wiley, New York, N.Y., 1971, Chapter XIV, G, p 589.
2. M. Kurata, Y. Tsumashima, M. Iwata, and K. Kamata in “Polymer Handbook,” 2nd ed, J. Brandrup and E. H. Immergut, Ed., John Wiley & Sons, New York, N.Y., 1975.