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3. A. O. Lebedev and M. R. Muzyka, “Technical diagnostics of the material condition by the LM hardness method,” in: Problems of Life and Operational Safety of Structures, Constructions, and Machines [in Ukrainian], Paton Institute of Electric Welding, National Academy of Sciences of Ukraine, Kiev (2006), pp. 97–101.
4. GOST 22761-77. Metals and Alloys. Method of Brinell Hardness Measurement with Portable Static Hardness Meters [in Russian], Izd. Standartov, Moscow (1977).
5. M. N. Khrushchev, Sclerometry [in Russian], Nauka, Moscow (1968).