1. Ahmed, N., andD. K. Sunada: Nonlinear flow in porous media. Jour. Hydr. Div., ASCE95 (1969).
2. Bachmat, Y.: Basic transport coefficients as aquifer characteristics. International Association of Scientific Hydrology Symposium on Fractured Rocks, Dubrovnik,1, 63, (1965).
3. Bhattacharaya, R. N., V. I. Gupta andG. Sposito: On the stochastic foundations of the theory of unsaturated flow. Water Resources Research (1976), in press.
4. Bear, J.: Dynamics of Fluids in Porous Media. New York: Elsevier. 1972.
5. Carman, P. C.: Flow of Gases through Porous Media. London: Butterworths. 1956.