1. M. S. Koval'chenko, “The dynamics of mechanical actions on materials. V. Damping oscillations in a third order dynamic system,” Poroshk. Metall., Nos. 5/6, 29–34 (1994).
2. M. S. Koval'chenko, “Mechanical properties of isotropic porous materials,” ibid., Nos. 9–10, 75–83 (1996).
3. V. V. Migulin, V. I. Medvedev, E. R. Mustel' and V. N. Parygin, Fundamentals of the Theory of Oscillations [in Russian], Nauka, Moscow (1988).
4. M. S. Koval'chenko, “The dynamics of mechanical actions of materials. I. General Theory,” Poroshk. Metall., No. 7, 41–48 (1993).
5. M. S. Koval'chenko, “The dynamics of mechanical actions on materials. II. Autooscillations under the action of an impact,” ibid., No. 8, 8–16 (1993).