1. Al-Sayari SS, Zötl JG (eds) (1978) Quaternary period in Saudi Arabia. Springer-Verlag, Wein
2. Conyers L, Goodman D (1997) Ground penetrating radar. An introduction for archaeologists. AltaMira Press, California
3. Elawadi E, El-Qady G, Salem A, Ushijima K (2001) Detection of cavities using pole-dipole resistivity technique, vol 61. Memoirs of the Faculty of Engineering, Kyushu University, pp 101–112
4. Fisher E, McMechan G, Annan P (1992) Acquisition and processing of wide-aperture ground-penetrating radar data. Geophysics 57:495–504
5. Hoek E, Palmieri A (1998) Geotechnical risks on large civil engineering projects. Keynote address for Theme I. International Association of Engineering Geologists Congress, Vancouver, Canada, Sept 21–25