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von der Heyde, C. (1975a, August 01). A method for improving the results of primary investigation by including the reasons for non-response in sample design and weighting. ANA - ESOMAR. Retrieved September 20, 2024, from
von der Heyde, C. (1975a, August 01). A method for improving the results of primary investigation by including the reasons for non-response in sample design and weighting (German). ANA - ESOMAR. Retrieved September 20, 2024, from