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2. Selection Bias Related To Parental Consent in School-Based Survey Research
3. Bundesagentur für Arbeit (BA) (2012). “Bezugsgröße 2012.” Technical Report, Statistik der Bundesagentur für Arbeit, May.
4. “Informed Consent for Web Paradata Use,”;Couper;Survey Research Methods,2013
5. Changes in Telephone Survey Nonresponse over the Past Quarter Century