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              Nickel, B. / Berger, M. / Schmidt, P. / Plies, K. (1995) Qualitative Sampling in a Multi- Method-Study -Practical Problems of Method Triangulation in Sexual Behavior Research. In: Quality and Quantity. Volume 29. S. 223-240.
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              Nickel, B.; Berger, M.; Schmidt, P.; Plies, K (1995): Qualitative Sampling in a Multi- Method Survey. Practical Problems of Method Triangulation in Sexual Behaviour Research. In: Quality & Quantity, No. 29,223-240
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              ., Berger, M., Schmidt, P., Plies, K. (1995). Qualitative Sampling in a Multi- Method-Study -Practical Problems of Method Triangulation in Sexual Behavior Research. Quality and Quantity, 29 pp. 223-240.
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