1. J. S. Jacobs, “Magnetic materials and applications in quarter-century overview,”50, No. 11, 7294–7306 (1979).
2. Yu. M. Pyatin (ed.), Permanent Magnets (Handbook) [in Russian], Energiya, Moscow (1980), pp. 6–8.
3. G. G. Gnesin (ed.), Sintered Materials for Electrical Engineering and Electronics (Handbook) [in Russian], Metallurgiya, Moscow (1981), pp. 284–304.
4. V. V. Sergeev and T. N. Bulygina, Hard Magnetic Materials [in Russian], Energiya, Moscow (1980).
5. C. Graham, “Thermomagnetic treatment,” in: Magnetic Properties of Metals and Alloys [Russian translation], IL, Moscow (1961), pp. 374–409.