1. N. I. Lazarenko, ?Electric-spark alloying of metal surfaces: present status and perspectives,? Elektron. Obrab. Mater., No. 5, 46?58 (1967).
2. G. V. Samsonov, A. D. Verkhoturov, E. A. Zaitsev, et al., ?Formation and some characteristics of hardened layers produced by electric-spark alloying with hard alloys,? Poroshk. Metall., No. 10, 34?39 (1976).
3. N. N. Sereda, M. S. Koval'chenko, I. T. Belik, et al., ?Use of hard alloys based on titanium carbide as wear-resistant materials and cutting tools,? Poroshk. Metall., No. 5, 94?97 (1977).
4. Dictionary and Handbook of the Friction, Wear, and Lubrication of Machine Components [in Russian], Naukova Dumka, Kiev (1979).
5. A. D. Verkhoturov, S. N. Kirilenko, and V. T. Bondar', ?Electric-spark alloying of steels with WC-Co hard metals,? Poroshk. Metall., No. 8, 67?71 (1980).