Singer, E., H.-J. Hippler und N. Schwarz, 1992: Confidentiality Assurances in Surveys: Reas- surance or Threat? International Journal of Public Opinion Research 4: 256-268.
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Singer, E., Hippler, H. J., Schwarz, N. (1992). Confidentiality Assurances in Surveys: Reas- surance or Threat?. International Journal of Public Opinion Research, 4 pp. 256-268.
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