1. The Acousto-Ultrasonics Approach;Vary,1987
2. MOLINA, G.J. and HADDAD, Y.M., On the Identification of Residual Impact Properties of Materials by Acousto-Ultrasonics - A Pattern Recognition Approach, Acta Mechanica Sinica, Vol. 11, No. 1, 34-43.
3. ANDREWS, H.C., Introduction to Mathematical Techniques in Pattern Recognition,
4. On the Characterization of the Linear Viscoelastic Response of a Class of Material by Acousto-Ultrasonics;Iyer,1993