1. A dual source gamma ray traversing mechanism suitable for the non-destructive simultaneous measurement of bulk density and water content in columns of swelling soil;Bridge;Aust. J. Soil Res.,1973
2. Mesures des teneurs en eau d'échantillons de sol non saturés par atténuation du rayonnement gamma émis par une source d'américium 241;Cisler;C.R. Acad. Sci. Paris,1969
3. Measurement of attenuation of Cs and Am gamma rays for soil density and water content determinations;Corey,1971
4. Gamma-radiation attenuation for measuring bulk density and transient water flow in porous materials;Davidson;J. Geophys. Res.,1963
5. Column scanning with 60 keV gamma radiation;De Swart;Soil Sci.,1971