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Respondent incentives in a national face-to-face survey: effects on outcome rates, sample composition and fieldwork efforts [journal article]
Source: Methoden, Daten, Analysen (mda), 7 (2013) 1. p.89-122
Allgemeine Bevölkerungsumfrage der Sozialwissenschaften 2004: Daten des ALLBUS 2004 verfügbar [journal article]
Source: ZUMA Nachrichten, 29 (2005) 56. p.104-110