7.2.2 Solutions of the Richards equation: solutions of the ...... Equation (1.13) is
exactly the general expression of anisotropic non-linear ...... [1] R. BUTTERFIELD
: A natural compression law for soils, Geotechnique .... [39] R. NOVA: Sinfonietta
classica: an exercise on classical soil modelling, ...... tions, Dunod, Paris, 1967. 
