1. Huisman J. A., Hubbard S. S., Redman J. D., Annan A. P., "Measuring soil water content with ground- penetrating radar: A review", Vadose Zone Journal Vol. 2 (2003) 476-491. ## 2. Maijala P., Saarenketo T., Valtanen P., " Correlation of some parameters in GPR measurement data with quality properties of pavements and concrete bridge decks", Proceedings of the Fifth International Conference on Ground Penetrating Radar, June 12-16, Kitchener, Ontario, Canada, Vol. 2 of 3 (1994) 393-406. ## 3. Cassidy N. J., "Evaluating LNAPL contamination using GPR and dielectric analysis: Practical implications for signal attenuation and attribute analysis studies", Journal of Contaminant Hydrology, Vol. 94 No. 1–2 (2007) 49-75. ## 4. Olhoeft G. R., Capron D. E., "Petrophysical causes of electromagnetic dispersion", in Proc. of the Fifth Int'l. Conf. on Ground Penetrating Radar, Kitchener, Ontario, 12-16 June (1994) 145-152. ## 5. Annan A. P., Waller W.M., Strangway D. W., Rossiter J. R., Redman, J. D. and Watts R. D., "The electromagnetic response of a low-loss, 2-layer, dielectric earth for horizontal electric dipole excitation", Geophysics, Vol. 40, No. 2 (1975) 285-298. ## 6. Beres M., Huggenberger P., Green A. G., Horstmeyer H., "Using two and three dimensional georadar methods to characterize glaciofluvial architecture. Sedimentary Geology 129 (1999) 1-24. ## 7. Zeng X., McMechan G. A., "GPR characterization of buried tanks and pipes", GEOPHYSICS, Vol. 62, No. 3, (1997) 797-806. ## 8. Lutz P., Garambois S., Perroud H., "Influence of antenna configurations for GPR survey: information from polarization and amplitude versus offset measurements", Geological Society, London, Special Publications, 211 (2003) 299-313. ## 9. Kofman L., Ronen A. and Frydman S., "Detection of model voids by identifying reverberation phenomena in GPR records", Journal of Applied Geophysics 59 (2006) 284-299. ## 10. Shaari A., Ahmad R. S. and Chew TH., "Effects of antenna-target polarization and target medium dielectric contrast on GPR signal from non-metal pipes using FDTD simulation", NDT & E International, 43 (2010) 403-8. ## 11. Słowik M., "Influence of measurement conditions on depth range and resolution of GPR images: The example of lowland valley alluvial fill (the Obra River, Poland) ", Journal of Applied Geophysics, 85 (2012) 1-14. ## 12. Metwaly M., "Application of GPR technique for subsurface utility mapping: A case study from urban area of Holy Mecca, Saudi Arabia", Measurement 60 (2015) 139-145. ## 13. Prego F. J., Solla M., Puente I. and Arias P., "Efficient GPR data acquisition to detect underground pipes", NDT & E International, 91(2017) 22-31. ## 14. Sadiku M. N. O., "Numerical techniques in electromagnetics. Second edition", Boca Raton London New York Washington (2001) D.C. CRC press. ## 15. Knödel K., Lange G. and Voigt H. J., "Environmental geology: handbook of field methods and case studies", Google Books Result, 1357 pages, Chapter 4, Geophysics (2007). ## 16. Annan A. P., "Ground-penetrating radar workshop notes, Sensors and Software Inc", Mississauga, ON, Canada, (2001) 192. ##17. Jol H. M., "Ground-Penetrating Radar theory and applications. First edition, Elsevier Science", (2009) 543. ## 18. Irving J., Knight R., "Numerical modeling of ground penetrating radar in 2-D using MATLAB", J. of Computers & Geosciences, 32 (2006) 1247-1258. ## 19. Bergmann T., Robertsson J. O. A., and Holliger K., "Numerical properties of staggered finite-difference solutions of Maxwell’s equations for ground-penetrating radar modeling", Geophysical Research Letters 23, (1996) 45-48. ## 20. Davis J. L. and Annan A. P., "Ground Penetrating Radar for High-resolution mapping of soil and rock stratigraphy", Geophysical Prospecting, 37 (1989) 531-551. ## 21. www.malags.com. ## 22. Reynolds J. M., "An introduction to applied and environmental geophysics", John Wiley Press, Chapter 12 (1997) 682-749. ##