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              Hippler, H.-J./ Schwarz, N./ Noelle-Neumann, E. (1989): Response Order Effects in Dichoto- mous Questions: The Impact of Administration Mode. ZUMA-Arbeitsbericht 89/17. Mannheim.
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              Hippler, H.-J./ Schwarz, N./ Noelle-Neumann, E. (1989): Response Order Effects in Dichotomous Questions: The Impact of Administration Mode. ZUMA- Arbeitsbericht 89/17. Mannheim.
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              Hippler, H.-J./Schwarz, N./Noelle-Neumann, E., 1989: Response Order Effects in Dichotomous Questions: The Impact of Administration Mode. ZUMA-Arbeitsbericht 89/17. Mannheim.
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              Hippler, H.J.'/Schwarz, N./Noelle-Neumam, E.. 1989: Response order effects: The irnpact of administration mode. (American Association for Public Opinion Research. St. Petersburg Beach. FL.). ZUMA-Arbeitsbericht 89/ 16.
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