@article{Beullens2018,
author = {Beullens, K. and Loosveldt, G. and Vandenplas, C. and Stoop, I.},
title= {Response rates in the European Social Survey: Increasing, decreasing, or a matter of fieldwork efforts? Survey Methods: Insights from the Field},
year = {2018},
doi = {10.13094/SMIF-2018-00003},
}