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We are very grateful to Seymour M. Lipset, Martin Trow and James S. Coleman who provided the data of their study to the Zentralarchiv für empirische Sozialforschung, University of Cologne, so that the secondary analysis reported in section III of this paper could be carried out. Beside Miss Hannelore Bröker and Miss Heidrun Helber who helped in editing the final English version we would also like to thank Professor Erwin K. Scheuch and the Zentralarchiv.
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Hummel, H.J., Opp, KD. On the relation between theory and research in sociology. Qual Quant 3, 23–61 (1969). https://doi.org/10.1007/BF00166504
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DOI: https://doi.org/10.1007/BF00166504