@article{Kuha2018,
author = {Kuha, J. and Butt, S. and Katsikatsou, M. and Skinner, C.J.},
title= {The effect of probing “don’t know” responses on measurement quality and nonresponse in surveys},
year = {2018},
doi = {10.1080/01621459.2017.1323640},
volume = {113},
number = {521},
pages = {26--40},
}