8Vanmarcke E H. Probabilistic Modeling of soil Profiles[J]. ASCE. 1977, GT11. 1227-1246.
9Damika Wickremesinghe, Campanella R G. Scale of Flu-ctuation Asa Descriptor of Soil Variability[M]. Probabilistic Method in Geotechnical Engineering, K. S. Li&Lo(eds), Balkema, Rotterdam,1993.
10Melchers R E. Search-based Importance Sampling[J]. Struct Safety, 1990,9:117-128.