1. Plato. “Timaeus.” English Translation by R. D. Archer Hinds, McMillan and Co., London (1888).
2. P. C. Yates and J. W. Trebilcock. SPI, 16th Ann. Tech. Conf. Reinf. Plast. 8-B (1961).
3. J. Bjorksten and L. L. Yaeger. Mod. Plast.
29, 124 (1952).
4. E. P. Plueddemann, H. A. Clark, L. E. Nelson, and K. R. Hoffmann. Mod. Plast.
39, 136 (1962).
5. H. Ishida and J. L. Koenig. J. Polym. Polym. Phys. Ed., 17(10), 1807 (1979).