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3. H. Ulrich, Introduction to Industrial Polymer, 2nd Edition, Hanser, Munich, 1993, pp. 50–51.
4. The effect of temperature on the fracture of two partially crystalline polymers; polypropylene and nylon
5. N.I. Sax, R.J. Lewis Sr., Hawley’s Condensed Chemical Dictionary, 11th Edition, Van Nostrand Reinhold, New York, 1987, p. 574.