1. Waterflow calculations by means of gamma absorption and tensiometer field measurements in the unsaturated soil profile;Giesel,1969
2. Soil moisture measurement by gamma transmission method;Ryhiner;J. Hydrol.,1969
3. Utilisation de l'Emission Gamma de l'Americium-241 pour la Mesure de la Teneur en Eau d'Echantillons de Sols non-saturés;Vachaud,1969