3Stevens Don L Jr. Variable density grid - based sampling designs for continuous spatial populations [J].Environmetrics, 1997, 8: 164 - 195.
4Stevens Don L Jr,Olsen Anthony R. Spatially balanced sampling of natural resources[J]. Journal of the American Statistical Association. 2004,99(465) :262 - 278.
5Stehman Slemphen V. Basic probability sampling designs for themarie map accuracy assessment[J].International Journal of Remote Sensing, 1999,20 ( 12 ) : 2423 - 2441.
6Stevens Don L Jr, Olsen Anthony R. Variance estimation for spatially balanced samples of environmental resources[J ]. Environmetrics, 2003,14:593 - 610.
7Mark David M. Neighbor- based properties of some orderings of two-dimensional space[J]. Geographical Analysis, 1990,2:145 - 157.
