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Kellhammer and Warncke (1978a, September 01). Analysis of missing values and analysis of scales measuring social strata in epidemiologic pilot studies. ANA - ESOMAR. Retrieved September 23, 2024, from
Kellhammer and Warncke (1978a, September 01). Analysis of missing values and analysis of scales measuring social strata in epidemiologic pilot studies (German). ANA - ESOMAR. Retrieved September 23, 2024, from