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3. V. V. Matveev and A. P. Yakovlev, ?Determination of the vibration decrement of a nonlinear system of hysteresis type by the width of the resonance peak of the amplitude response,? Probl. Prochn., No. 9, 84?86 (1976).
4. Yu. A. Klikh, ?Single-frequency vibrations of a system with N degrees of freedom taking energy dissipation in the material into account,? in: Energy Dissipation in Vibrations of Elastic Systems [in Russian], Kiev (1963), pp. 9?20.
5. G. S. Pisarenko, Energy Dissipation with Mechanical Oscillations [in Russian], Izd. Akad. Nauk Ukr. SSR, Kiev (1962).