References
- Survey Sampling -theory and methods- A.Chaudhuri;H.Stenger
- Statistics & Probability Letters v.25 Improved predictors in survey sampling under a super-population model A.K.Srivastava
- Model Assisted Survey Sampling C.E.Sarndal;B.Swensson;J.H.Wretman
- Biometrika v.57 no.2 On finite sampling theory under certain linear regression models R.M.Royall
- Sampling Techniques W.G.Cochran