Bretschi D, Daikeler J, Neumann A. Does Including Internet Users in the Mail Mode Improve the Data Quality of a Probability-Based Mixed-Mode Panel? SRM [Internet]. 2026 Aug. 10 [cited 2026 Oct. 10];20(2):229-46. Available from: https://ojs.ub.uni-konstanz.de/srm/article/view/8351