@article{Groves2008,
author = {Groves, Robert M. and Peytcheva, Emilia},
title= {The impact of nonresponse rates on nonresponse bias: A meta-analysis},
year = {2008},
doi = {10.1093/poq/nfn011},
journal = {The Public Opinion Quarterly},
volume = {72},
number = {2},
pages = {167--189},
}