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Freitag, D. E. (1974a, September 01). Improving cluster techniques. ANA - ESOMAR. Retrieved September 23, 2024, from
https://ana.esomar.org/documents/improving-cluster-techniques
Winkler and Freitag (1972a, June 15). The practical application of market segmentation. ANA - ESOMAR. Retrieved September 23, 2024, from
https://ana.esomar.org/documents/the-practical-application-of-market-segmentation