On estimation in three and four phase sampling. Hanif, S., Butt, N., S., & Shahbaz, M., Q. Sci.Int.(Lahore), 27(4):3019-3022, Science International, 2015.
On estimation in three and four phase sampling [pdf]Paper  abstract   bibtex   
Multiphase sampling has been widely used in literature when information about sampling frame is not available. In this short note it is shown that the estimation in multiphase sampling can only be based upon two phases. The result has been proved for three and four phases only

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