中国科学院数学与系统科学研究院期刊网
AMS
Imputation of Mean of Ratios for Missing Data and Its Application to PPSWR Sampling
Guo Hua ZOU, Ying Fu LI, Rong ZHU, Zhong GUAN
Acta Mathematica Sinica . 2010, (5): 863 -874 .  DOI: 10.1007/s10114-010-6271-3