Scherpenzeel, A., K. Axt, M. Bergmann, S. Douhou, A. Oepen, G. Sand, K. Schuller, S. Stuck, M. Wagner, and A. Börsch-Supan. “Collecting Survey Data Among the 50+ Population During the COVID-19 Outbreak: The Survey of Health, Ageing and Retirement in Europe (SHARE)”. Survey Research Methods, Vol. 14, no. 2, June 2020, pp. 217-21, doi:10.18148/srm/2020.v14i2.7738.