HEBERLEIN, Th.A. & BAUMGARTNER, R. 1s a questionnaire necessary i n a second mail i n g ? Publ i c Opinion Q u a r t e r l y , 45, 1981, 102-108.
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HEBERLEIN, T., BAUMGARTNER, R. (1981). 1s a questionnaire necessary i n a second mail i n g ? Publ i c Opinion Q u a r t e r l y , 45. pp. 102-108.
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