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Hansen, J. (1980a, September 01). The refinement of multi-media analyses about useful criteria for media planning (German). ANA - ESOMAR. Retrieved July 06, 2024, from
Juchems, A. (1980a, September 01). Advertising expenditure- advertising effect (German). ANA - ESOMAR. Retrieved July 06, 2024, from
https://ana.esomar.org/documents/advertising-expenditure--advertising-effect-german-
Rehorn, J. (1980a, September 01). How reliable are portfolio tests? (German). ANA - ESOMAR. Retrieved July 06, 2024, from
https://ana.esomar.org/documents/how-reliable-are-portfolio-tests-german-
Müller-Veeh and Opfer (1979a, June 15). Study of the reading habits of physicians (German). ANA - ESOMAR. Retrieved July 06, 2024, from
https://ana.esomar.org/documents/study-of-the-reading-habits-of-physicians-german-
Erben and Geiger (1979a, June 15). Methodical test to probe the usefulness of surveys bases on self administered and phone interviews to analyse the competition between local banks (German). ANA - ESOMAR. Retrieved July 06, 2024, from
Von Rónai-Horváth and Büttner (1978a, September 01). Quality versus quantity (German). ANA - ESOMAR. Retrieved July 06, 2024, from
https://ana.esomar.org/documents/quality-versus-quantity-german-
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 July 06, 2024, from
Schweiger, G. (1977a, August 28). Perceived risk (German). ANA - ESOMAR. Retrieved July 06, 2024, from
https://ana.esomar.org/documents/perceived-risk-german-
Holm, K. (1977a, June 15). Market research as a decision aid for an image campaign, as demonstrated by the information campaign of Esso A.G. (German). ANA - ESOMAR. Retrieved July 06, 2024, from