1. J. A. Brydson, “Plastics Materials”, 5th ed, Butterworths-Heinemann, Oxford, 1989, pp 521–571.
2. T. L. Richardson, “Industrial Plastics: Theory and Application”, 2nd ed, Delmar Publishers Inc., New York, N.Y., 1989, pp 141–203.
3. J. T. Baker, R. S. Cooke, and S. Sifniades, U. S. Patent 4 194 038 (Mar. 18, 1980).
4. S. E. Bales, U. S. Patent 4 388 455 (Jun. 14, 1983).
5. K. F. Miller and W. Hilakos, U. S. Patent 4 465 820 (Aug. 14, 1984).