1. Guttmann, V. and Schütze, M. in ‘Proc. Conference on Alloys for Gas Turbines and Other Applications’ (Eds W. Betz et al.), Reidel, Dordrecht, 1986, p. 293
2. Berchtold, L., Sockel, H. G. and Ilschner, B. in ‘Behaviour of High Temperature Alloys in Aggressive Environments’ (Ed. I. Kirman), Institute of Metals, London, 1980, p. 927