1. Intake factors for cylindrical piezometer tips;Al-Dhahir;Soil Sci.,1969
2. Time lag and soil permeability in groundwater observations;Hvorslev;Waterways Exp. Stn., U.S. Army Corps Eng., Vicksburg, Miss., Bull.,1951
3. A study of intergranular and fissure permeability in Chalk and Permian aquifers, using double-packer injection testing;Price;J. Hydrol.,1981
4. Theory of Bessel functions;Watson,1966