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Köcher and Roth-Flockerzi (1994a, June 15). The concerns and needs of insurance customers with particular focus on the situation in East Germany. ANA - ESOMAR. Retrieved September 21, 2024, from
Tennstädt and Köcher (1980a, June 15). New research results require methodological change. ANA - ESOMAR. Retrieved September 21, 2024, from
https://ana.esomar.org/documents/new-research-results-require-methodological-change