1. J. L. Miejering and M. J. Druyvesteyn, Phillips Research Report, 2 (1947) 81.
2. Idem, ibid, 3 (1947) 260.
3. F. N. Rhines, W. A. Johnson and W. A. Anderson, Trans. AIME 147 (1942) 205.
4. O. A. Kupcis and B. Ramaswami, Mater. Sci. Eng. 5 (1969) 43.
5. ?Handbook of Materials Science? Vol. 1 (Chemical Rubber Co., Cleveland, Ohio, 1974) p. 264.