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SCIMA valintakori viitteet

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A comparison of the effect of promised and provided lotteries, monetary and gift incentives on mail survey response rate, speed and cost.
Journal of the Market Research Society
1990 : JAN, VOL. 32:1, p. 141-162
 1990 Gajraj, A.
Faria, A.
Dickinson, J.
SCIMA