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Brüdgam and Studynka (1979a, June 15). The expansion of medical marketing research by the inclusion of political and social aspects. ANA - ESOMAR. Retrieved June 05, 2024, from
Brüdgam and Studynka (1977a, March 01). Practical experiences with forecasting. ANA - ESOMAR. Retrieved June 05, 2024, from
https://ana.esomar.org/documents/practical-experiences-with-forecasting