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Pfifferling, J. (1982a, June 15). Tv audience data checkup. ANA - ESOMAR. Retrieved May 01, 2024, from
https://ana.esomar.org/documents/tv-audience-data-checkup
Pfifferling, J. (1980a, June 15). Childrens' TV consumption . ANA - ESOMAR. Retrieved May 01, 2024, from
https://ana.esomar.org/documents/childrens-tv-consumption-