1. A. P. Chekmarev, P. I. Klimeoko, and G. A. Vinogradov, Poroshkovaya metallurgiya, No. 2 (1963).
2. A. N. Nikolaev, Trudy Gor'kovskogo politekhnicheskogo instituta,14, No. 2 (1958).
3. G. A. Vinogradov and L. M. Komarova, Poroshkovaya metallurgiya, No. 1 (1962).
4. P. Evans and G. Smith, Powder Metallurgy, No. 3 (1959).
5. G. A. Vinogradov and V. P. Katashinskii, Poroshkovaya metallurgiya, No. 3 (1963).