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2. Recent research on mailed questionnaire response rates;Baumgartner,1984
3. Tables of samples sizes in the analysis of variance;Bratcher;Journal of Quality Technology,1970
4. Randomization procedures for the analysis of educational experiments;Collier;University of Minnesota Co-operative Research Project No. 2593,1965
5. Predicting response rates to mailed surveys: A comment;Eichner;American Sociological Review,1981