On the Variance of the Ratio Estimator.
Metrika, Tome 18 (1972), pp. 209-215.

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     author = {T.J. Rao},
     title = {On the {Variance} of the {Ratio} {Estimator.}},
     journal = {Metrika},
     pages = {209--215},
     publisher = {mathdoc},
     volume = {18},
     year = {1972},
     zbl = {0242.62017},
     url = {http://geodesic.mathdoc.fr/item/MET_1972__18_175509/}
}
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T.J. Rao. On the Variance of the Ratio Estimator.. Metrika, Tome 18 (1972), pp. 209-215. http://geodesic.mathdoc.fr/item/MET_1972__18_175509/