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\bibitem{Jann_etal1990} Jann, M., Tanner, J., Ernst, M. - L., Albrecht, P., H{\"a}mmig, R., Seidenberg, A., et al. (1990). \textit{Drogalkohol Nr. 3/90 : Perspektiven einer neuen Drogenpolitik} (Vol. 14). Lausanne: ISPA-Press.

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