@article{MET_1991__38_2_176333,
     author = {S. Sengupta and D. Kundu},
     title = {Admissible {Unbiased} {Variance} {Estimation} in {Finite} {Population} {Sampling} {Under} {Randomized} {Response.}},
     journal = {Metrika},
     pages = {71--82},
     publisher = {mathdoc},
     volume = {38},
     number = {2},
     year = {1991},
     zbl = {0738.62007},
     url = {http://geodesic.mathdoc.fr/item/MET_1991__38_2_176333/}
}