1. V. J. Rakhovskii, G. V. Levchenko, and O. K. Teodorovich, Make- and-Break Contacts of Electrical Apparatus [in Russian], ?Énergiya? (1966).
2. G. V. Levchenko, V. I. Rakhovskii, and I. N. Frantsevich, Sintered Electrical Components [in Russian] (1965).