1. G. Petot-Ervas, C. Petot to be published
2. R.L. Levin, J.B. Wagner, Trans. Met. Soc. AIME, 233, 159, 1965.
3. J. Benard, Oxid. des métaux, Gauthier-Villars 1962.
4. A.V. Malik, D.P. White, Oxid. Met. 16, 339, 1981.
5. Y. Ikeda, K. Nii, Oxid. Met., 12, 487, 1978.