Preface
Chapter 4. The oscillating systems with elements of different orders
1. Conservative systems with nonlinear restoring elements
2. The effect of ε2-order of the excitation of ε-order 
3. The effect of ε2-order due to the interaction between the excitations of ε2-order
4. The effect of ε2-order caused by the interaction between the nonlinear restoring element and parametric excitation of ε-order
5. The interaction of elements with two different orders 
6. Quasilinear oscillations in systems with large static deflections
Appendix 
1. The regular and critical oscillations
2. The amplitude-frequency relationship and resonance curve
3. The elimination of harmonics of high degrees and associated equations
4. The associated resonance curve and non-equivalence lines
5. Strange elements and original resonance curve
6. The abbreviated form of the second stability condition 
References 
Subject index