1. V. I. Zaitsev, Fizika Plastichnosti Gidrostaticheski Szhatykh Kristallov [Physics of Plasticity of Hydrodynamically Compressed Crystals] (Kyiv: Naukova Dumka: 1983) (in Russian).
2. V. A. Beloshenko, V. N. Varyukhin, and V. Z. Spuskanyuk, Teoriya i Praktika Gidroekstruzii [Theory and Practice of Hydroextrusion] (Kyiv: Naukova Dumka: 2007) (in Russian).
3. GOST 21318-82, Izmerenie Mikrotverdosti Tsarapaniem Almaznymi Nakonechnikami [Measurement of Microhardness by Scratching with Diamond Tips] (Moscow: Izd-vo Standartov: 1983) (in Russian).
4. P. Yu. Volosevich, Abstr. of the 5-th Int. Conf. 'Mechanics of Materials Fracture and Structural Strength' (June 24-27, 2014) (Lviv: Tz OV 'Prostir-M': 2014), p. 157 (in Ukrainian).
5. Stress Raisers and Their Role in Formation of Mechanical Properties of Polycrystals with the Nanosize Components of Structure