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2. Evolution of NDE continues for ceramics;Sheppard;American Ceramic Society Bulletin,1991
3. Bhardwaj, M. C., Evolution, Practical Concepts and Examples of Ultrasonic NDC. Ceramic Monographs—Handbook of Ceramics, pp. 1–7, Supplement to Interceram, 1992, 41.
4. Measurement of the elastic constants of ceramics by resonant frequency methods;Davis;Transactions of the British Ceramic Society,1968
5. American Society for Testing and Materials (ASTM) test C1259. Dynamic Young's Modulus, Shear Modulus, and Poisson's Ratio for Advanced Ceramic Materials by Impulse Excitation of Vibration.