9Burgos P, Madejón E, .Pérez-de-Mora A, et ai. Spatial variability of the chemical characteristics of a trace-element-contaminated soil before and after remediation[J]. Geoderma, 2006, 130 ( 1/2): 157-175.
10Johnston K, Vet Hoef J M, Krivoruchko K, et al. Using ArcGIS Geostatistical Analyst[M]. CA, USA: ESR, 2001.