Enderle, Tobias, Ralf Münnich, and Christian Bruch. “On the Impact of Response Patterns on Survey Estimates from Access Panels”. Survey Research Methods 7, no. 2 (June 30, 2013): 91-101. Accessed December 3, 2021. https://ojs.ub.uni-konstanz.de/srm/article/view/5036.