5. Zhang,R.,A. W. Warrick and D. E. Myers,1990. Variance within a finite domain as a function of sample support size. Math Geology 22:107-121.
6. Zhang,R.,A. W. Warrick and J. F. Artiola,1992. Numerical modeling of free-drainage water samplers in the shallow vadose zone. Advances in Water Resources 15:251-258.
7. Zhang,R.,A. W. Warrick and D. E. Myers,1992. Improvement of soil textural estimates using spectral properties. Geoderma 52:223-234.
8. Zhang,R.,D. E. Myers,and A. W. Warrick,1992. Estimation of spatial distribution of soil chemicals using pseudo-cross-variograms. Soil Science Society of America Journal 56:1444-1452.
9. Zhang,R.,K. Huang and M. Th. van Genuchten,1993. An efficient Eulerian-Lagrangian method for solving convection-dispersion transport problems in steady and transient flow fields. Water Resources Research 29:4131-4138. 10. Zhang,R.,A. W. Warrick,and D. E. Myers,1994. Heterogeneity,plot shape effect and optimum plot size. Geoderma 62:183-197.
11. Zhang,R.,and M. Th. van Genuchten,1994. New models for the unsaturated soil hydraulic properties. Soil Science 158:77-85.
12. Zhang,R.,K. Huang,and J. Xiang,1994. Solute transport in large homogeneous and heterogeneous soils. Advances in Water Resources 17:317-324.
13. Zhang,R,S. Rahman,G. F. Vance,and L. C. Munn,1995. Geostatistical analyses of trace elements in soils and plants. Soil Science 159:383-390.
14. Zhang. R.,1995. Prediction of solute transport using a transfer model and the convection-dispersion equation. Soil Science 160:18-27.
15. Yang,J. R. Zhang,and J. Wu,1996. An analytical solution of macrodispersivity for adsorbing solute transport in unsaturated soils. Water Resources Research 32:355-362.
16. Zhang,R. J. Yang,and Z. Ye,1996. Solute transport through the vadose zone: field studies and stochastic analyses. Soil Science 161:270-277.
17. Zhang,R.,J. D. Hamerlinck,S. P. Gloss,and L. Munn,1996. Determination of non-point source pollution using GIS and numerical models. Journal of Environmental Quality 25:411-418.
18. Zhang,R.,and J. Yang,1996. Iterative solution of a stochastical differential equation: an efficient method for simulating soil variability. Geoderma 72:75-88.
19. Zhang,R.,1997. Determination of soil sorptivity and hydraulic conductivity from the disc infiltrometer. Soil Science Society of America Journal 61:1024-1030.
20. Zhang,R.,P. Shouse,and S. Yates,1997. Use of pseudo-crossvariograms and cokriging to improve estimates of soil solute concentrations. Soil Science Society of America Journal 61:1342-1347.
21. Zhang,R.,1997. Infiltration models for the disc infiltrometer. Soil Science Society of America Journal 61:1597-1603.
22. Zhang,R.,1998. Estimating soil hydraulic conductivity and macroscopic capillary length from the disc infiltrometer. Soil Science Society of America Journal 62:1513-1521.
23. Zhang,R.,P. Shouse,and S. Yates,1999. Estimates of soil nitrate distributions using cokriging with pseudo-crossvariograms. Journal of Environmental Quality 28:424-428.
24. Zhang,R.,A. Krzyszowska-Waitkus,G. F. Vance,and J. Qi. 2000. Pesticide transport in field soils. Advances in Environmental Research 4:59-68.
25. Zhang,R.,2000. A generalized transfer function model for solute transport in heterogeneous soils. Soil Science Society of America Journal 64:1959-1602.
26. Zhang,R.,A. L Wood,C G. Enfield. 2003. Stochastical analysis of surfactant enhanced remediation of DNAPL contaminated soils. Journal of Environmental Quality 32:957-965.
27. Hao,X.,R. Zhang,and A. Kravchenko. 2005. A Mass-conservative Switching Method for Simulating Saturated-unsaturated Flow. Journal of Hydrology 311: 254-265.
28. Wang,K.,and R. Zhang. 2005. Testing the Pore-Solid Fractal Model for the Soil Water Retention Function. Soil Science Society of America Journal 69:776-782.
29. Liu,H.H.,R. Zhang,and G. S. Bodvarsson. 2005. An Active Region Model for Capturing Fractal Flow Patterns in Unsaturated Soils: Model Development. Journal of Contaminated Hydrology 80:18-30.
30. Wang,K.,R. Zhang,and H. Yasuda. 2006. Characterizing scale-dependent heterogeneity of soil water movement by dye infiltration experiments. Journal of Hydrology,328:559-571.
31. Wang, K.,R. Zhang, Y. Hiroshi. 2009. Characterizing heterogeneous soil water flow and solute transport using information measures. Journal of Hydrology 370: 109–121. 32. Sheng, F., K. Wang,R. Zhangand H. Liu. 2009. Characterizing soil preferential flow using iodine–starch staining experiments and the active region model. Journal of Hydrology 367: 115–124.