%0 Journal Article
%A T.J. Rao
%T On the Variance of the Ratio Estimator.
%J Metrika
%D 1972
%P 209-215
%V 18
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MET_1972__18_175509/
%F MET_1972__18_175509