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Geiger and Erben (1979a, June 15). Methodical test to probe the usefulness of surveys bases on self administered and phone interviews to analyse the competition between local banks. ANA - ESOMAR. Retrieved May 26, 2024, from
Erben and Geiger (1979a, June 15). Methodical test to probe the usefulness of surveys bases on self administered and phone interviews to analyse the competition between local banks (German). ANA - ESOMAR. Retrieved May 26, 2024, from