1. M.F. Ashby, Acta Met., 22 (1974), p. 275.
2. E. Artz, M.F. Ashby, and K.E. Easterling, Met. Trans. A, 14A (1983), p. 211.
3. A Mortensen et al., Met. Trans. A, 20A (1989), p. 2535.
4. Carlos G. Levi, Met. Trans. A, 19A (1988), p. 699.
5. U. Mitra and T.W. Eagar, Met. Trans. B, 22B (1991), p. 73.