4Zhang ZQ,,Griffith DA.Developing User-friendly Spatial Statistical Analysis Modules for GIS:an Example Using Arcview[].ComputeEnvironmentandUrbanSystems.1997
5Zhang Z Q,Griffith D A.Integrating GIS Components and Spa-tialstatistical Analysis in DBMS[].Geographical InformationScience.2000
6Anselinl.Spatial Econometrics:Methods and Models[]..1988