1. W. D. Callister, Materials Science and Engineering An Introduction (John Wiley & Sons Inc., Massachusetts, 2010), pp. 489.
2. Empirical Dependence of Elastic Moduli on Porosity for Ceramic Materials
3. ASTM C 674–88, “Standard Test Methods for Flexural Properties of Ceramic Whiteware Materials” in Annual Book of ASTM Standards, vol. 15. 02.
4. C. Hellier, Handbook of Nondestructive Evaluation (McGraw-Hill,USA, 2003), pp. 7.1–7.11.
5. J. Krautkramer and H. Krautkramer, Ultrasonic Testing of Materials (Springer-Verlag Berlin Heidelberg GmbH, New York, 1990).