1. Experimental observation of the influence of contact nonlinearity on the reflection of bulk and propagation of surface acoustic waves;Len;Sov. Phys. Acoust.,1991
2. Ultrasonics of nonlinear contacts: propagation, reflection and NDE-applications;Solodov;Ultrasonics,1998
3. SAW reflection: experimental evidence and NDE applications;Solodov;Ultrasonics,1993
4. Oscillations and Waves;Kneubuhl,1997
5. Theory of Oscillators;Andronov,1966