1. Ultrasonic wave dispersion and attenuation in fresh mortar;Aggelis;NDT & E International,2004
2. AGU-Vallen Wavelet, R2005.1121, www.vallen.de.
3. Controlling grout spreading in tunnel grouting – analyses and developments of the GIN-method;Brantberger;Tunnelling and Underground Space Technology,2000
4. Ground stabilization for tunnel construction in mixed-face conditions;Darrag;Tunnelling and Underground Space Technology,1999
5. Hamstad M.A., 2005. An Illustrated Overview of the Use and Value of a Wavelet Transformation to Acoustic Emission Technology, AGU-Vallen Wavelet R2005.1121, User’s Guide.