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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
Coverage- and Nonresponse-Effekte bei Online-Bevölkerungsumfragen [collection article]
Source: VS Verl. für Sozialwiss., 2009