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Hofmans, P. (1988a, June 15). The motorway effect. ANA - ESOMAR. Retrieved April 28, 2024, from
https://ana.esomar.org/documents/the-motorway-effect
Crisci, M. (1988a, June 15). Poster research: From cover and frequency to effectiveness. ANA - ESOMAR. Retrieved April 28, 2024, from
https://ana.esomar.org/documents/poster-research-from-cover-and-frequency-to-effectiveness