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Ophoff, V. F. (1977a, June 15). Public and policy. ANA - ESOMAR. Retrieved June 07, 2023, from
Ophoff, V. F. (1979a, March 01). Introduction. ANA - ESOMAR. Retrieved June 07, 2023, from
Ophoff and Kalim (1984a, June 15). Quality control and standards in different countries in the context of multinational surveys. ANA - ESOMAR. Retrieved June 07, 2023, from