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              *Bech, M. & Kristensen, M. (2009). Differential response rates in postal and Web-based surveys in older respondents. Survey Research Methods, 3(1), 1-6. https://doi.org/10.18148/srm/2009.v3i1.592.
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              Bech, M. and M. B. Kristensen (2009). "Differential response rates in postal and web-based surveys 2. among older respondents." Survey Research Methods, 3, pp. 1-6.
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              Bech, M., and M. B. Kristensen (2009), "Differential Response Rates in Postal and Web-Based Surveys among Older Respondents," Survey Research Methods, 3, 1-6.
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              Mickael, Kristensen, Morten 2009: Differential response rates in postal and Web- based surveys among older respondents. In: Survey Research Methods 3, 1: 1-6.
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