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Schaefer, F. (1996a, December 01). Monadically or by paired comparison?. ANA - ESOMAR. Retrieved September 26, 2024, from
https://ana.esomar.org/documents/monadically-or-by-paired-comparison-
Schaefer, W. (1976a, June 15). At least sixty percent of promotion material is wasted!. ANA - ESOMAR. Retrieved September 26, 2024, from
https://ana.esomar.org/documents/at-least-sixty-percent-of-promotion-material-is-wasted-