1. M. Yu. Bal’shin, Dokl. Akad. Nauk, 67, No. 5, 831–840 (1949).
2. M. Eudier, Powder Met., No. 9, 278–282 (1962).
3. A. Ya. Peras, Probl. Prochn., No. 3, 50–57 (1969).
4. R. Haynes, Powder Met., 14, 64–73 (1971).
5. R. Haynes, Powder Met., 20, 17–25 (1977).