Brooks, R. H. and Corey, A. T. (1964). Hydraulic properties of porous media, Colorado State University Hydrology Paper, No. 3. Fort Collins, CO.
Burdine, N. T. (1953). Relative permeability calculations from pore size distribution data, Transactions of the Metallurgical Society of AIME, Vol. 198, 71–78.
Childs, E. C. and Collis-George, N. (1950). The permeability of porous materials, Proceedings of the Royal Society, London, Series A, Vol. 201A, 392–405.
Darcy, H. (1856). Histoire des Foundataines Publique de Dijon, Dalmont, Paris, 590–594.
Fredlund, D. G., Rahardjo, H., and Fredlund, M. D. (2012). Unsaturated Soil Mechanics in Engineering Practice, Wiley, New York.
Fredlund, D. G. and Xing, A. (1994). Equations for the soil-water characteristic curve, Canadian Geotechnical Journal, Vol. 31, No. 3, 521–532.
Fredlund, D. G., Xing, A., and Huang, S. Y. (1994b). Predicting the permeability function for unsaturated soils using the soil water characteristic curve, Canadian Geotechnical Journal, Vol. 31, No. 4, 533–546.
Gardner, W. R. and Widtsoe, J. A. (1921). The movement of soil moisture, Soil Science Journal, Vol. 11, pp. 215–232.
Gardner, W. R. (1958a). Mathematics of isothermal water conduction in unsaturated soils, Highway Research Board Special Report 40, presented at the International Symposium on Physico-Chemical Phenomenon in Soils, Washington, DC, 78–87.
Green, R. E. and Corey, J. C. (1971a). Calculation of hydraulic conductivity: A further evaluation of some predictive methods, Soil Science Society of America Proceedings, Vol. 35, 3–8.
Kholoosi, M. M., Estabragh, A. R., and Pashankpoor, S. (2014a). Estimation of Unsaturated Permeability Using Statistical Methods, 1st National Conference on Soil Mechanics and foundation Engineering, 3-4 Dec., Faculty of Civil Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran, 376.(In Farsi)
Kholoosi, M. M., Estabragh, A. R., Pashankpoor, S., and Arabzadeh, A. (2014b). Calculation of Soil Water Characteristic curve Parameter Using Genetic Algorithm by R, 1st National Conference on Soil Mechanics and foundation Engineering, 3-4 Dec., Faculty of Civil Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran, 377. (In Farsi)
Kunze, R. J., Uehara, G., and Graham, K. (1968). Factors important in the calculation of hydraulic conductivity, Soil Science Society of America Proceedings, Vol. 32, 760–765.
Leong, E. C. and Rahardjo, H. (1997a). Permeability functions for unsaturated soils, Journal of Geotechnical and Geoenvironmental Engineering, ASCE, Vol. 123, No. 12, 1118–1126.
Likos, W. J. and Lu, N. (2004). Unsaturated Soil, Wiley, New York.
Marshall, T. J. (1958). A relation between permeability and size distribution of pores, Soil Science Journal, Vol. 9, 1–8.
Mualem, Y. (1976a). A new model for predicting hydraulic conductivity of unsaturated porous media, Water Resources Research, Vol. 12, 513–522.
Mualem, Y. (1978). Hydraulic conductivity of unsaturated porous media: Generalized macroscopic approach, Water Resources Research, 14(2), 325–334.
Rahimi, A., Rahardjo, H., and Leong, E. C. (2014). Effect of range of soil–water characteristic curve measurements on estimation of permeability function, Engineering Geology Journal, Elsevier, Vol. 185, 96–104.
Rajkai, K., Kabos, S., and Van Genuchten, M.Th. (2004). Estimation of water retention characteristics from soil properties: comparison of linear, nonlinear and concomitant variable methods. Soil & Tillage Research, ELSEVIER. 79, 145–152.
Van Genuchten, M. T. (1980). Closed-form equation for predicting the hydraulic conductivity of unsaturated soils. Soil Sci. Soc. Am. J. 44, 892–898.