6Freeze R A. A stochastic-conceptual analysis of one-dimensional groundwater flow in nonuniform homogeneous media[ J]. Water Resources Research, 1975,11 (5) :725 - 741.
7Delhomme J P. Spatial variability and uncertainty in groundwater flow parameters: a geostatistical approach [ J]. Water Resources Research, 1979,15:269 - 280.
8Bhatt K. Uncertainty in wellhead protection area delineation due to uncertainty in aquifer parameter values[ J] .Journal of Hydrology, 1993,149 (1 -4) : 1 - 8.