1. T. G. Langdon,Met. Sci. 16 (1982) 175.
2. C. E. Pearson,J. Inst. Metals,54 (1934) 111.
3. O. D. Sherby andJ. Wadsworth, ?Superplasticity in Aerospace,? edited by H. C. Heikkenen and T. R. McNelley (Metallurgical Society of AIME, Warrendale, Pennsylvania, 1988) p. 3.
4. G. D. Bengough,J. Inst. Metals 7 (1912) 123.
5. Idem, ibid. 8 (1912) 180.