00317nam a2200121Ia 4500082001900000100001700019245005400036260004900090300000900139490003700148500000500185700000500190  aSA.6bSi617.CS  aSingh, M. P.  aComparison of some ratio cum product estimatorsb  aCalcuttabIndian Statistical Institutec1968  a10p.  aNSS technical paper no. 24/68/10  a  a