1. H.R. Phelps, J.R. Wood, Titanium '92 Science and Technology, 1992, p. 193.
2. G.W. Kuhlman, K.A. Rohde, A.K. Chakrabarti, Titanium '92 Science and Technology, 1992, p. 1371.
3. R.R. Boyer, A.E. Caddey, Titanium '92 Science and Technology, 1992, p. 1647.
4. R. Neal, P. Blenkinsop, Titanium '80 Science and Technology, 1980, p. 1287.