(1967). C.J. Benning , "Plastic Foams: The Physics and Chemistry of Product Performance and Process Technology", Wiley-Interscience , 1969, Vol. 1, p. 223, Vol. 2, p. 38.
5.
Ibid., Vol. 2, p. 337.
6.
Ibid., Vol. 1, p. 231.
7.
Ibid., Vol. 1, p. 228.
8.
J. Crank, "The Mathematics of Diffusion", Oxford University Press , 1956, p. 2.
9.
W.M. Lee and D.W. Liou, "Mechanical Properties of Plastic Foams: A Model for the Effect of Aging" , Proceeding of the 1971 Kyoto International Conference on the Mechanical Behavior of Materials. Vol. III.
10.
J. Crank, and G.S. Park, "Diffusion in Polymer", Academic Press, 1968, p. 263.
11.
Ibid., p. 280.
12.
E.F. Cuddihy , and J. Moacanin, J. Cell. Plas., Vol. 3, No. 1, 73 (1967).