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2. Health surveys in the Netherlands;Berg van der,1977
3. Concepts and definitions in the Health Household-Interview Survey;U.S. Department of Health, Education and Welfare,1958
4. Origin, program, and operation of the U.S. National Health Survey;U.S. Department of Health, Education and Welfare,1963
5. Der Deutsche Mikrozensus als Amtliche Mehrzweckstichprobe;Herberger,1975