%0 Journal Article
%A J. Lanke
%T On UMV-Estimators in Survey Sampling.
%J Metrika
%D 1973
%P 196-202
%V 20
%I mathdoc
%U http://geodesic.mathdoc.fr/item/MET_1973__20_175606/
%F MET_1973__20_175606