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Müller-Veeh and Opfer (1982a, June 15). Media measurement by direct recording methods. ANA - ESOMAR. Retrieved September 27, 2024, from
https://ana.esomar.org/documents/media-measurement-by-direct-recording-methods
Müller-Veeh and Opfer (1979a, June 15). Study of the reading habits of physicians . ANA - ESOMAR. Retrieved September 27, 2024, from
https://ana.esomar.org/documents/study-of-the-reading-habits-of-physicians-
Müller-Veeh and Opfer (1979a, June 15). Study of the reading habits of physicians (German). ANA - ESOMAR. Retrieved September 27, 2024, from
https://ana.esomar.org/documents/study-of-the-reading-habits-of-physicians-german-
Opfer, G. (1978a, February 01). Sense and non-sense in cluster analysis. ANA - ESOMAR. Retrieved September 27, 2024, from
https://ana.esomar.org/documents/sense-and-non-sense-in-cluster-analysis
Opfer and Müller-Veeh (1976a, December 01). Empirical results along the way to a price elasticity test. ANA - ESOMAR. Retrieved September 27, 2024, from
https://ana.esomar.org/documents/empirical-results-along-the-way-to-a-price-elasticity-test
Opfer and Müller-Veeh (1976a, December 01). Empirical results along the way to a price elasticity test (German). ANA - ESOMAR. Retrieved September 27, 2024, from
https://ana.esomar.org/documents/empirical-results-along-the-way-to-a-price-elasticity-test-german-
Müller-Veeh and Opfer (1974a, June 15). A new method of copy-test evaluation. ANA - ESOMAR. Retrieved September 27, 2024, from
https://ana.esomar.org/documents/a-new-method-of-copy-test-evaluation