1. Punjab Irrigation Research, Institute Research Publication, v.;Singh,1939
2. Movement of water through soils In relation to the nature of the pores;Nelson;Soil Sci. Soc. Amer., Proc,1940
3. Proper spacing and depth of tile-drains determined by physical properties of the soil;Neal,1934
4. The variability of the permeability “constant” at low hydraulic gradients during saturated water flow in soils;Bodman;Soil Sci. Soc. Amer., Proc.,1937
5. Permeability measurements on disturbed soils samples;Fireman;Soil Sci.,1944