1. V. P. Ivanov, Vibrations of Turbine Wheels [in Russian], Mashinostroenie, Moscow (1983).
2. Yu. S. Vorob’ev, Vibrations of the Blade System of the Turbine [in Russian], Naukova Dumka, Kiev (1988).
3. A. P. Zin’kovs’kyi, Coupled Vibrations of Regular Mechanical Systems with Broken Symmetry [in Ukrainian], Author’s Abstract of the Doctor Degree Thesis (Tech. Sci.), Kyiv (1996).
4. V. V. Matveev and A. P. Bovsunovskii, “On determination of vibration characteristics of a beam with a closing crack in bending vibrations,” Strength Mater., 32, No. 3, 211–224 (2000).
5. M. Krawczuk and W. Ostachowicz, “Damage indicators for the diagnostics of fatigue cracks in structures by vibration measurements – a survey,” J. Theor. Appl. Mech., 34, No. 2, 307–326 (1996).