1. Gamma-radiation for measuring bulk density and transient water flow in porous materials;Davidson;J. Geophys. Res.,1963
2. Evaporation and water transfer in relation to the surface structure and the water content of the ground;Olesen,1970
3. X-ray attenuation coefficients from 10 keV to 100 MeV;Grodstein;Natl. Bur. Stad. U.S., Circ.,1957
4. Water content measurement with 60 keV gamma ray attenuation;Groenevelt,1969
5. The BASF Combined Soil Moisture/Density Gauge and other Moisture/Density Equipment produced by NEA;Somer,1969