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Erzberger, C. & Prein, G. (1997). Triangulation: Validity and empirical-based hypothesis construction. Quality and Quantity, 31, 141-151.
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Erzberger, Chr.lPrein, G. (I 997a): Triangulation: Validity and empirically-based hypothesis construction. In: Quality & Quantity, Heft 31, S. 141-154.
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Erzberger, Christian & Prein, Gerald (1997). Triangulation: validity and empiri- cally based hypothesis construction. Quality & Quantity, 31(2), 141-154.
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Erzberger, Christian; Prein, Gerald (1997b): Triangulation: Validity and Empiri- cally-Based Hypotheses Construction. In: Quality & Quantity 31: 141-154
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Erzberger, Christian; Prein, Gerald (1997b): Triangulation: Validity and Empiri- cally-based Hypothesis Construction. In: Quality and Quantity, Vol. 31, No. 2, S. 141-154
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Erzberger, Christian; Prein, Gerald (I 997b): Triangulation: Validity and Empirically-based Hypothesis Construction. In: Quality and Quantity, Vol. 31, No. 2, S. 141-154;
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