1. Theory of fluid flow in undeformable porous media;Aravin,1965
2. Modelling water table movement in drained soils with depth dependent hydraulic conductivity;Armstrong;Agric. Water Manage.,1991
3. Infiltration of water into non-uniform soil;Bouwer,1969
4. Transient drainage equation for non-homogeneous soils;Chu;Trans. ASAE,1977
5. New formula for determining depth and spacing of sub-surface drains in irrigated lands;Dumm;J. Agric. Eng.,1954