1.
Personalisation in advance letters does not always increase response rates: demographic correlates in a large scale experiment
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3.
The ethnic diversity and collective action survey (EDCAS): technical report
Innovation in der Markt- und Sozialforschung: das forsa.omninet-Panal
Methodenbericht: Algemeine Bevölkerungsumfrage der Sozialwissenschaften - ALLBUS 1982