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van den Heuvel, R. R. (1983a, November 02). Optimizing the product line. ANA - ESOMAR. Retrieved June 29, 2024, from
https://ana.esomar.org/documents/optimizing-the-product-line
Molnar, Hoffmann and Molnar (1977a, August 28). Enlargement of the product profile with the utilization of production experience gained in co-operation. ANA - ESOMAR. Retrieved June 29, 2024, from
de Vulpian, A. (1966a, June 01). Use of periodic quantitative surveys in view of the adjustment of advertising strategies and of a better understanding of the process of advertising action. ANA - ESOMAR. Retrieved June 29, 2024, from