1. Yu. G. Dorofeev, Poroshkovaya Met., No. 8, 18 (1966).
2. N. F. Kunin and B. D. Yurchenko, Poroshkovaya Met., No. 2, 3 (1964).
3. M. Yu. Bal'shin, Metal Powder Science [in Russian], Metallurgizdat, Moscow (1948).
4. M. Yu. Bal'shin, Powder Metallurgy [in Russian], Metallurgizdat, Moscow (1948).
5. K. Konopicky, Radex Rundschau,141 (1948).