1Brewer K W R,Hanif M.Sampling With Unequal Probabilities [M].Hei- delberg:Springer-Verlag, 1983.
2Horvitz D G,Thompson D J.A Generalization of Sampling Without Re- placement From A Finite Universe[J].Journal of the American Statisti- cal Association,1952,47(260).
3Sahoo L N,Das B C,Singh G N.A Note on An IPPS Sampling Scheme [J].Asta Advances in Statistical Analysis,2006,(90).
4Yates F, Grundy P M.Selection Without Replacement From WithinStrata With Probability Proportional to Size[J].Journal of the Royal Sta- tistical Society,1953,15(2).
5Asok C,Sukhatme B V.On Sampford's Procedure of Unequal Probabili- ty Sampling Without Replacement [J].Journal of the American Statisti- cal Association,1976,71 (356).
6Mukhopadhyay P.Theory and Methods of Survey Sampling[M].New Delhi : Prentice-Hall of India, 1998.