@article{MET_1977__24_175725,
     author = {T.J. Rao},
     title = {Estimating the {Variance} of the {Ratio} {Estimator} for the {Midzuno-Sen} {Sampling} {Scheme.}},
     journal = {Metrika},
     pages = {203--208},
     publisher = {mathdoc},
     volume = {24},
     year = {1977},
     zbl = {0366.62036},
     url = {http://geodesic.mathdoc.fr/item/MET_1977__24_175725/}
}