R.P. Chapuis, “Predicting the Saturated Hydraulic Conductivity of Sand and gravel Using Effective Diameter and Void Ratio,” Canadian Geotechnical Journal, Vol. 41, No. 5, 2004, pp. 787-795. doi:10.1139/t04-022
 C. P. K. Gallage and T. Uchimura, “Effects of Dry Density and Grain Size Distribution on Soil-Water Characteristic Curves of Sandy Soils,” Soils and Foundations, Vol. 50, No. 1, 2010, pp. 161-172. doi:10.3208/sandf.50.161
 D. G. Fredlund, A. Xing, S. Huang, “Predicting the Permeability Function for Unsaturated Soils Using the Soil-Water Characteristic Curve,” Canadian Geotechnical Journal, Vol. 31, No. 4, 1994, pp. 533-546. doi:10.1139/t94-062
 W. R. Gardner, “Some Steady State Solutions of the Unsaturated Moisture Flow Equation with Application to Evaporation from a Water Table,” Soil Science, Vol. 85, 1958, pp. 228-232. doi:10.1097/00010694-195804000-00006
 J. M. Davidson, L. R. Stone, D. R. Nielsen and M. E. Larue, “Field Measurement and Use of Soil-Water Properties,” Water Resources Research, Vol. 5, 1969, pp. 1312-1321. doi:10.1029/WR005i006p01312
 Y. Mualem, “Hysteretical Models for Prediction of the Hydraulic Conductivity of Unsaturated Porous Media Media,” Water Resources Research, Vol. 12, No. 6, 1976, pp. 1248-1254. doi:10.1029/WR012i006p01248
 M. Th. van Genuchten, “A Closed Form Equation for Predicting the Hydraulic Conductivity of Unsaturated Soils,” Soil Science Society of America Journal, Vol. 44, No. 5, 1980, pp. 892-898. doi:10.2136/sssaj1980.03615995004400050002x
 E. C. Leong and H. Rahardjo, “Permeability functions for unsaturated soils,” Journal of Geotechnical and Geoenvironmental Engineering, Vol. 123, No. 12, 1997, pp. 1118- 1126. doi:10.1061/(ASCE)1090-0241(1997)123:12(1118)
 D. G. Fredlund, M. D. Fredlund and N. Zakerzadeh, “Predicting the Permeability Function for Unsaturated Soils,” International Conference on Clays and Clay Minerology, Shioukoza, 11-13 January 2001, pp. 215-222.
 J. P. Lobbezoo and S. K. Vanapalli, “A Simple Technique for Estimating the Coefficient of Permeability of Unsaturated Soils,” Proceedings of the 55th Canadian Geotechnical Conference, Niagra Falls, 2002.
 H. K. Shada and N. Ravichandran, “New Soil-Water Characteristic Curve and Its Performance in Finite Element Simulation of Unsaturated Soils,” International Journal of Geomechanics, accepted with minor revision, October 2010.
 A. Elzeftaw and K. Cartwright, “Evaluating the Saturated and Unsaturated Hydraulic Conductivity of Soils,” ASTM Standards and Engineering Digital Library, West Conshohocken, 1981, pp. 168-181. doi:10.1520/STP28323S
 D. E. Elrick and D. H. Bowman, “Note on an improved apparatus for soil moisture flow measurements,” Soil Science Society of America Proceedings, Vol. 28, 1964, pp. 450-453.doi:10.2136/sssaj1964.03615995002800030045x