References
- Hartley , H. O. and Ross , A. 1954 . Unbiased ratio estimators . Nature , 174 : 270 – 271 .
- Särndal , C.-E. , Swenson , B. and Wretman , S. 1992 . Model Assisted Survey Sampling , New York : Springer-Verlag .
- Cressie , N. A.C. and Chan , N. H. 1989 . Spatial modeling of regional variables . J. Am. Stat. Assoc. , 84 : 393 – 401 .
- Cressie , N. A.C. 1993 . Statistics for Spatial Data , New York : Wiley .
- Cochran , W. G. 1977 . Sampling Techniques , New York : John Wiley & Sons .
- Chaudhuri , A. and Stenger , H. 2005 . Survey Sampling: Theory and Methods , 2 , New York : Chapman and Hall .
- Cressie , N. A.C. and Read , T. R.C. 1989 . Spatial data analysis of regional counts . Biome. J. , 31 : 699 – 719 .
- Cressie , N. A.C. 1989 . Geostatistics . Am. Stat. , 43 : 197 – 202 .
- Moran , P. A.P. 1950 . Notes on continuous stochastic phenomena . Biometrika , 37 : 17 – 33 .
- Geary , R. C. 1954 . The contiguity ratio and statistical mapping . Inc. Stat. , 5 : 115 – 145 .
- Cliff , A. D. and Ord , J. K. 1973 . Spatial Autocorrelation , London : Pion .
- Cliff , A. D. and Ord , J. K. 1981 . Spatial Processes: Models and Applications , London : Pion .
- Raj , D. 1968 . Sampling Theory , New York : Mc-Graw Hill .
- Rao , J. N.K. 1979 . On deriving mean square errors and other non-negative unbiased estimators in finite population sampling . J. Indian Stat. Assoc. , 17 : 125 – 136 .