Matsuo, Hideko, Jaak Billiet, Geert Loosveldt, Frode Berglund, and Øyven Kleven. “Measurement and Adjustment of Non-Response Bias Based on Non-Response Surveys: The Case of Belgium and Norway in the European Social Survey Round 3”. Survey Research Methods 4, no. 3 (December 31, 2010): 165–178. Accessed July 19, 2024. https://ojs.ub.uni-konstanz.de/srm/article/view/3774.