1. Three stage sampling with varying probabilities without replacement.;Ecimovic;J. Ind. Soc. Agr. Statist.,1956
2. Some consequences of interpretation of varying probability sampling.;Sethi;Sankhyd,1962
3. Some remarks on double sampling for stratification;Singh;Biometrika,1965
4. Sampling without replacement with probability proportional to size.;Stevens;J. Roy. Statist. Soc.,1958
5. Sampling with replacement.;Sukhatme;J. Ind. Soc. Agr. Statist.,1952