1. Transport Phenomena;Bird,1956
2. Water movement through a swelling material;Blackmore;Austral. J. Soil Res.,1965
3. Gamma radiation attenuation for measuring bulk density and transient water flow in porous materials;Davidson;J. Geo-phys. Res.,1963
4. Non-Equilibrium Thermodynamics;De Groot,1962
5. Gairon, S. 1968 Private communication.