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              Kna ¨uper, Ba ¨rbel, Norbert Schwarz, Denise Park, and Andreas Fritsch. 2007. "The Perils of Interpreting Age Differences in Attitude Reports: Question Order Effects Decrease with Age." Journal of Official Statistics 23:515-28.
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              Knauper, B., Schwarz, N., Park, D., & Fritsch, A. (2007). The perils of interpreting age differences in attitude reports: Question order effects decrease with age. Journal of Official Statistics, 23(4), 515-528.
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              Knäuper, B., Schwarz, N., Park, D., & Fritsch, A. (2007). The Perils of Interpreting Age Differences in Attitude Reports: Question Order Effects Decrease with Age. Journal of Official Statistics, 23(4), 515-528.
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              Knauper, B., Schwarz, N., Park, D., Fritsch, A. (2007). The perils of interpreting age differences in attitude reports: Question order effects decrease with age. Journal of Official Statistics, 23(4), pp. 515-528.
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