@article {chen2000efficient, title = {Efficient random imputation for missing data in complex surveys}, journal = {Statistica Sinica}, volume = {10}, number = {4}, year = {2000}, pages = {1153{\textendash}1170}, publisher = {C/O DR HC HO, INST STATISTICAL SCIENCE, ACADEMIA SINICA, TAIPEI 115, TAIWAN}, author = {Chen, J and Rao, JNK and Sitter, RR} }