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Schwenzner, J. E. (1967a, August 01). Introduction of the panel method into industrial market research (German). ANA - ESOMAR. Retrieved December 02, 2023, from
Schwenzner, J. E. (1967a, August 01). Introduction of the panel method into industrial market research. ANA - ESOMAR. Retrieved December 02, 2023, from
https://ana.esomar.org/documents/introduction-of-the-panel-method-into-industrial-market-research