Rao, T JSengupta, SSinha, B K2013-08-162013-08-161991Metrika , v. 38, no. 1, p 335-343http://hdl.handle.net/10263/5555enSelection probabilitiesInclusion probabilitiesOrder relationsPPSWOR sampling schemeSome order relations between selection and inclusion probabilities for PPSWOR sampling schemeArticle