1. I. D. Radomysel'skii and N. I. Shcherban, Poroshkovaya metallurgiya 11 (1980) 12 (in Russian).
2. H. G. Van Bueren, “Imperfections in Crystals” (North Holland, Amsterdam, 1960).
3. C. C. Bradley, “High Pressure Methods in Solid Research” (Butterworth, London, 1969).
4. S. N. Gromyko, V. M. Mel'nik and I. N. Francevich, Poroskovaya metallurgiya 4 (1981) 76 (in Russian).
5. V. Lou, “Paramagnitnyi rezonans v tverdyh telah” (Inostr. Lit., Moskva, 1962) (in Russian).