1. Skinner, E.W., and Phillips, R.W. The Science of Dental Materials, p. 93. 5th ed. Philadelphia and London: W. B. Saunders and Co., 1960.
2. Gordon, M. Structure and Properties of High Polymers, p. 15. Monograph of the Plastics Institute, London.
3. Glasstone, S. Textbook of Physical Chemistry, pp. 1067 ff. 1st ed. London : MacMillan and Co., Ltd. (1940).
4. Skinner, E.W., and Phillips, R.W. The Science of Dental Materials, p. 85, Fig. 7-3. 5th ed. Philadelphia and London: W. B. Saunders and Co., 1960.