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Incentives and ethnic minorities: results of a controlled randomized experiment in the Netherlands [journal article]
Source: Survey Research Methods, 2 (2008) 3. p.159-165
An evaluation of incentive experiments in a two-phase address-based sample mail survey [journal article]
Source: Survey Research Methods, 7 (2013) 3. p.207-218
The effect of incentives on response rates and panel attrition: results of a controlled experiment [journal article]
Source: Survey Research Methods, 2 (2008) 3. p.151-158