Post, Julia, Fabian Class, and Ulrich Kohler. “Unit Nonresponse Biases in Estimates of SARS-CoV-2 Prevalence”. Survey Research Methods 14, no. 2 (June 2, 2020): 115–121. Accessed March 28, 2024. https://ojs.ub.uni-konstanz.de/srm/article/view/7755.