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2. Idem, ibid., J. Mater. Sci. 21 (1986) 4081.
3. Idem, Polymer 28 (1987) 1505.
4. R. W. Hertzberg andJ. A. Manson, in “Fatigue of Engineering Plastics” (Academic Press, New York, 1980) p. 106.
5. H. Nishimura, T. Shishido, M. Nakakura andH. Shibano, in “Ninth Plastic Fuel Gas Pipe Symposium” (American Gas Association, Arlington, Virginia, 1985) p. 70.