1. Characteristics of the impedance method of inspection and of impedance inspection transducers;Lange;Sov. J. NDT,1978
2. The impedance method for non-destructive inspection;Cawley;NDT International,1984
3. Shock and Vibration Handbook;Harris,1996
4. Modal Test: Theory and Practice;Ewins,1984
5. Theoretical and Experimental Modal Analysis;Maia,1997