Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Shambhu Dayal,Sampling for estimating weighted totals and averages,Annals of the Institute of Statistical Mathematics,00203157,Tokyo : Institute of Statistical Mathematics,1981,33,1,p165-176,https://cir.nii.ac.jp/crid/1521699230579222912,