1) Rubin, J., R. Steinhardt and P. Reiniger: Soil water relations during rain infiltration: 2. moisture content profiles during rains of low intensities, Soil Sci. Soc. Am. Proc., 28 (1), pp.1,-5 (1964)
2) Haverkamp, R., M. Vauclin, J. Touma, P. J. Wierenga and G. Vachaud: A comparison of numerical simulation models for one-dimensional infiltration, Soil Sci. Soc. Am. J., 41, pp.285-294 (1977)
3) Campbell G. S., 中野政詩・東山勇監訳: パソコンで学ぶ土の物理学, 鹿島出版会, pp.69-84 (1987)
4) Freeze, R. A.: The mechanism of natural groundwater recharge and discharge 1. One-dimensional, vertical, unsteady, unsaturated flow above a recharging or discharging ground-water flow system, Water Res. Res., 5 (1), pp.153-171 (1969)