1. Zbu-Zeid, N.: 1994, ‘Investigation of Channel Seepage Areas at the Existing Kaffrein Dam Site (Jordan) using Electrical Resistivity Measurements’,Journal of Applied Geophysics 32, 163–175.
2. Andersson, P. M., Andersson, K. P., Gustafsson, E., and Olsson, O.: 1990, ‘Investigation of Flow Distribution in a Fracture Zone Using Differential Radar Measurements’, in J. Lucius, G. Olhoeft, and S. Duke (eds.),Abstracts of the Third International Conference on Ground Penetrating Radar, U.S.G.S. Open File Report 90-414: 1.
3. Annan, A. P., Scaife, J. E., and Giamou, P.: 1990, ‘Mapping Buried Barrels with Magnetics and Ground Penetrating Radar’,Expanded Abstracts, Annual Meeting of the Society of Exploration Geophysicists 60, 422–423.
4. Annan, A. P., Cosway, S. W., and Redman, J. D.: 1991, ‘Water Table Detection with Ground-penetrating Radar’,Expanded Abstracts, Annual Meeting of the Society of Exploration Geophysicists 61, 494–496.
5. Annan, A. P. and Chua, L. T.: 1992, ‘Ground Penetrating Radar Performance Predictions’, in J. Pilon (ed.),Ground Penetrating Radar, Geological Survey of Canada Paper 90-4: 5–13.