@article{Deng2013,
author = {Deng, Y. and Hillygus, D.S. and Reiter, J.P. and Si, Y. and Zheng, S.},
title= {Handling attrition in longitudinal studies: The case for refreshment samples},
year = {2013},
doi = {10.1214/13-STS414},
volume = {28},
number = {2},
pages = {238--256},
}